3. At the playground, which one is an example of a wheel and axle?
A. merry-go-round B. seesaw
C. slide
D. swing
4. Why is wheel and axle a simple machine?
A. It is simple.
C. It has a wheel.
B. It is a machine.
D. It makes our work easier.
5. Which simple machine would stairs be an example?
A. inclined plane
B. lever C. pulley D. wedge
6. A stiff bar that moves about a fixed point is a
A. lever B. wheel and axle C. wedge
D. inclined plane
7. Which of the following is the use of inclined plane?
A. To deliver a person from high area to low area.
B. To deliver a person from low area to high area.
C. To lift an object easier by changing the direction of the effort force.
D. It lessens the effort exerted in transporting weight over a distance and height:
8. Which simple machine is made of rigid or strong bar that is free to move at a fixed point?
A. lever
B. pulley
D. wheel and axle
C. wedge
9. Seesaw, scissors, pliers are examples of which kind of
lever as illustrated below?
A. First-class lever C. Second-class lever
B. Third Class lever D. Fourth-class lever
10. Which simple is used by the man to move the barrel as shown in the picture below?
A. inclined plane
B. lever
C. screw
D. wedge
Answer:
3.B
4.B
5.A
6.D
7.A
8.B
9.D
10.A
Put the following in order of size, from smallest to largest
chromosome, gene; base pair
Answer:
The correct order of size - base pair < gene < chromosome.
Explanation:
Nitrogen base-pair attaches with the phosphate group and a sugar molecule to form a building block of DNA or nucleic acids. Nucleic acids make the gene is the physical and functional unit of hereditary that takes the information from parent cells to daughter cells.
Chromosomes are a structure that appears thread-like and makes the genome with different chromosomes. These structures are made up of wrapped DNA or genes around histone proteins.
a) varigated
leaves accumulates less Food than non-varigated leaves under similar condition
Answer:
Due to less number of chlorophyll.
Explanation:
The variegated leaves accumulates or produces less amount of food than non-variegated leaves under similar condition because variegated leaves has number of chlorophyll as compared to non-variegated leaves. Chlorophyll is a green pigment that is responsible for the photosynthesis in plants, without chlorophyll no photosynthesis occurs in the plants. The variegated leaves has less number of chlorophyll as compared to non-variegated leaves which leads to less production of food in variegated leaves.
Which factors were determined to directly cause the loss of skin pigmentation in humans as a result of natural selection?
(1 point)
1. a change in the diet of human populations as they settled in colder climates
2. the clothing worn by humans in the early 8th century
3.the interaction of human populations with predators in colder climates
4.the impact of UV radiation on folate and Vitamin D levels in human populations
Answer: The answer is 4
Explanation:
Vitamin D controls your skin pigment. It's kind of like when someone has an iron deficiency they get bruises and they turn a whiter shade.
Hope I helped :)
The factors that were determined to directly cause the loss of skin pigmentation in humans as a result of natural selection are the impact of UV radiation on folate and Vitamin D levels in human populations.
Ultraviolet B radiation produces diet D in human skin. Ultraviolet radiation can, however, smash folate. Folate is critical for the speedy increase of cells, particularly at some point in which its deficiency can motivate neural tube defects. The human frame additionally has a mechanism to save you overproduction of vitamins.
What is UV radiation?Ultraviolet is a shape of electromagnetic radiation with a wavelength from 10 nm to four hundred nm, shorter than that of seen light, but longer than X-rays. UV radiation is found in sunlight and constitutes approximately 10% of the whole electromagnetic radiation output from the Sun.
Thus it is learned that the above answers are well-explained factors that were determined to directly cause the loss of skin pigmentation in humans as a result of natural selection bout.
To learn more about natural selection refer to the link :
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Gene mutations can be caused by many things. These mutations are biologically important because they
can be passed to the offspring if they occur in any cell of the body
can result in a new variety of gene combinations in the species
are always harmful and therefore help to eliminate weak traits
occur at a regular rate and therefore can be controlled
Answer:
Can result in a new variety of gene combinations in the species
Explanation:
The third option is blatantly untrue- gene mutations are sometimes harmful, usually mundane and do nothing, and sometimes extremely helpful.
The fourth option is also untrue- genetic mutation is completely random.
This leaves us with the first two-
The first option is true, but it's not why genetic mutations are important, it's simply how they are passed on.
The second option is the awnser because gene diversity is extremely important in populations, and 'variety of gene combinations' is just another way to say gene diversity.
How does the movement of muscles attached to the ribcage and diaphragm initiate expiration? (3 points)
a
The muscles relax, which which flattens the diaphragm and increases the volume of the chest cavity.
b
The muscles relax, which pulls the ribcage downward and decreases the volume of the chest cavity.
c
The lungs contract and push the air from the lungs.
d
The lungs relax and pull the air into the lungs.
Answer: b
The muscles relax, which pulls the ribcage downward and decreases the volume of the chest cavity.
Explanation:
Which phase of cell division is shown?
anaphase II
telophase I
telophase II
prophase I of meiosis
Answer:
Anaphase II
Explanation:
I took the test
An organ that produces or releases a chemical is called a ___________. 20pts URGENT HELP FOR SCIENCE BRANLIEST
Answer:
gland?
Explanation:
Which of the following best describes succession
The evolution of species through natural selection to become different species
over time
The dranzes in species composition in a community over time as species
colonize an area
The reduction in Bioteesias o men over time
The creation of new e from nothing in an ecosystem
All of these are a good description of secession
Answer:
the greating new form ide
As a scientific concept, race Group of answer choices A. is very significant because it gives us a clearer understanding of human behavior than the concept of culture provides. B. is evidenced by the exclusive possession of particular types of genes. C. aids in explaining human diversity. D. is not very significant because it gives us little insight into human behavior. E. Both B and D
Answer:
D. is not very significant because it gives us little insight into human behavior.
Explanation:
Science can be defined as a branch of intellectual and practical study which systematically observe a body of fact in relation to the structure and behavior of non-living and living organisms (animals, plants and humans) in the natural world through experiments.
As a scientific concept, race is not very significant because it gives us little insight into human behavior.
This ultimately implies that, race is a scientific concept that holds no significant or absolute value since the nineteenth century.
Hence, the difference between humans shouldn't be described based on race according to the United Nations Educational, Scientific and Cultural Organization (UNESCO).
how would fossil fuel affect non terrestrial organisms?
Answer:
Explanation:
Drilling, extraction and burning of fossil fuels, endangers many desert biomes. Some deserts are used as dumping grounds for radioactive and chemical waste. Increasing dry periods and lack of vegetation from climate change can lead to more dust storms which further affect plant and animal species.
Different species of bumblebee compete for flower nectar in their ecosystem.
a. True
b. False
water is a polar compound because it exhibits____charges
Answer:
I think it is negative charges
Explanation:
hope this helps :)
Helpppppppo help help help help help help
Answer:
True
Explanation:
Cilia are essential for movement of paramecia.
Answer:
true
Explanation:
they do have cilia that helps them move
A virus that can switch from the lysogenic cycle to a lytic cycle is called
o transformation.
o latency.
o phage conversion.
o temperate.
o injection.
Transcribe the following sequence.
5' TCGGCGCTATACTTT 3
b. What enzyme does transcription?
Wildfires in Crater Lake burned approximately 33,000 acres in 2011, leaving 25 square miles of charred
timber and bare ground. The five-week fire burned the loblolly pine trees and seeds for which Bastrop
State Park is famous. Park rangers are hoping that new plant growth on the bare soil cover will
eventually be established as pine trees; however, immediately following a wildfire, the first plants which
emerge will most likely be grasses as a stage in-
a primary succession
b. secondary succession
c. tertiary succession
dclimax community
Answer:
Secondary succession
Explanation:
what is cell y and cell x
Answer:
Humans and most mammals have two sex chromosomes, the X and Y. ... Egg cells all contain an X chromosome, while sperm cells contain an X or a Y chromosome. This arrangement means that during fertilization, it is the male that determines the sex of the offspring.
Explanation:
hope that helped
where do I place echinodermata on the phylogenetic tree
Answer:
QUESTION:
where do I place Echinodermata on the phylogenetic tree?
ANSWER:
Echinoderms include starfish, sea urchins, sand dollars, and feather stars. Echinoderms are found in many different ocean environments, but most are found in reefs.
Explanation:
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How many layers are in a gram positive cell wall and how many are in a gram negative cell wall ?
The cell wall of gram-negative bacteria is thin (approximately only 10 nanometers in thickness), and is typically comprised of only two to five layers of peptidoglycan, depending on the growth stage. In gram-positive bacteria, the cell wall is much thicker (20 to 40 nanometers thick).
In DNA, what base pairs with guanine?
adenine
cytosine
thymine
guanine
Examples of organelles
Answer:
Nucleus, mitochondria, cell membrane, ribosome, golgi body
Explanation:
The two tubes found in vascular plants are the ?
a.stamen and pistil
b. xylem and phloem
C. stem and leaves
d. pollen and ovule
Answer:
a
Explanation:
Determine the direction of blood flow through the chambers, vessels and valves of the heart and lungs. Summarize your findings below beginning with oxygen-poor blood from the body entering the heart and ending with oxygen-rich blood leaving the heart to re-supply the body. 1 Vena cavae (vessels) 8 (vessels) 2 Right atrium (chamber) 9 (chamber) 3 (valve) 10 (valve) 4 (chamber) 11 (chamber) 5 (valve) 12 (valve) 6 (vessels) 13 (vessels) 7 Through the lungs (O2 picked up) 14 Through the body (O2 released)
Answer:
1 Vena cavae (vessels)
2 Right atrium (chamber)
3 Tricuspid valve (valve)
4 Right ventricule (chamber)
5 Pulmonary valve (valve)
6 Pulmonary artery (vessels)
7 Through the lungs (O2 picked up)
8 Pulmonary veins (vessels)
9 Left atrium (chamber)
10 Mitral valve (valve)
11 Left ventricle (chamber)
12 Aortic valve (valve)
13 Aorta (vessels)
14 Through the body (O2 released)
Explanation:
The oxygenated blood travels through the arteries distributing oxygen to the cells. Then the deoxygenated blood goes through the veins and to the heart and the lungs.
The deoxygenated blood enters the heart through the vena cavae. From there, it goes to the right atrium. The accumulation of blood in the right atrium opens the tricuspid valve, and the blood goes to the right ventricle. Between the right ventricle and the pulmonary vein, it is the pulmonary valve. The valve stops blood from going back to the ventricle once it is in the pulmonary artery. The pulmonary artery carries the blood to the pulmonary arterioles and these to the pulmonary capillaries, where the blood picks up oxygen and releases carbon dioxide. This process happens in the lungs.
Once that the blood has oxygen, it goes from the capillaries to the pulmonary venules. Then, to the pulmonary vein. The pulmonary vein brings the blood to the left atrium, then it goes through the mitral valve and flows to the left ventricle. Between the left ventricle and the aorta, it is the aortic valve. A valve that stops the blood from going back to the ventricle once it went to the aorta. From the aorta, the oxygenated blood goes to the rest of the body.
Bumblebees show some ability to control their own body temperature. During cold weather, bumblebees have been observed warming their flight muscles by shivering. The bees are able to maintain a body temperature several degrees above that of the surrounding air. Regulation of their internal body temperature is an example of A. diffusion B. synthesis C. respiration D. Homeostasis
Answer:
D. Homeostasis
Explanation:
An endocrine system refers to a series of ductless glands and organs responsible for the production and secretion of hormones that are used by the body for the performance of various functions such as metabolism, controlling growth, reproduction, mood, sleep, etc. These hormones are secreted directly into the circulatory system (blood) and then transported to the organs and tissues in the body.
Basically, the endocrine system contributes significantly to the state of homeostasis in the body.
Homeostasis can be defined as a process through which a living organism maintains a steady or stable physical, internal and chemical environment that is ideal to enhance life and proper functionality.
Hence, regulation of the internal body temperature of the bumblebee is an example of homeostasis.
Answer:
Homeostasis
Explanation:
Which product is typically made using softwood?
Answer:
Explanation:
The answer is furniture
The element carbon has multiple bonding patterns. Which bonding pattern cannot be formed by carbon?
A. CC
B. C-C-C
C.C.C.C
D. C=C=C
Answer:
D
Explanation:
Because there is only one carbon it says they are equal
A. CC and C. C.C.C
Carbon has four valence electrons, so it can achieve a full outer energy level by forming four covalent bonds.When it bonds only with hydrogen, it forms compounds called hydrocarbons. Carbon can form single, double, or triple covalent bonds with other carbon atoms.A carbon atom can form the following bonds:
Four single bonds. One double and two single bonds. Two double bonds. One triple bond with one single bond.In options, B and D there are single and double formation between carbon atoms. Thus these are correct bonding patterns.
Therefore, bonding pattern cannot be formed by carbon is option A and C.
Learn more:
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6. a) In what way is the genetic code in all organisms the same? (1 point)
Answer:
they all come from the same ancestor, and all organisms have DNA made of the same molecules that form our genetic code. DNA in every organism has the bases: A,T,C,G.
Also, don't use this if it's still June 2021 and you're doing ap ex, we might have the same teacher.
All living organisms use the same genetic code. This shows that all organisms share a common evolutionary history.
What is a genetic code ?The genetic code is the set of rules used by living cells to translate information encoded within genetic material into proteins. It is a sequence of three DNA or RNA nucleotides that corresponds with a specific amino acid or stop signal during protein synthesis.
The genetic code is universal. Living systems use nucleic acids and the same three-base codons to direct the synthesis of proteins from amino acids. For example, the mRNA codon UUU, codes for phenylalanine in all cells of all organisms.To know more about genetic code here
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state another hormone that influences the concentration of glucose in the blood apart from insulin and glucose
Answer:
Amylin
Epinephrine
cortisol
growth hormone
How were the mountains surrounding the Canyon formed?