Answer:
meiosis
Explanation:
hi I'm in 8th grade and that's all I know so far about this topic hope this helps :)
Jane had two wind up clocks that had not been used for years. She decided to try them out, so she wound both, set the time, and started them at the same time. An hour later, clock A had gained one minute while clock B had lost two. The next morning clock A said 7 A.M. while clock B was at 6 A.M. What time was it when she started the clocks?
Right now, the clocks are one hour apart. The clocks are 3 minutes apart every hour. It would take 19 hours and 20 minutes to get from 6 A.M. to 10:40 A.M.
How to find a time?Right now, the clocks are one hour apart.
The clocks are 3 minutes apart every hour (A gains 1 - B loses 2)
Therefore, it would take 20 real hours for them to be separated by one hour.
Clock A advances by one minute per hour, moving 20 hours and 20 minutes throughout that time.
It would be 10:40 a.m. from 7 a.m. back 20 hours and 20 minutes.
Clock B advances by 2 minutes every hour, or 19 hours and 20 minutes, in a period of 20 hours.
It would take 19 hours and 20 minutes to get from 6 A.M. to 10:40 A.M.
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True or false evolution occurs when there is a change in the gene pool of a population
Answer:
False
Explanation:
It might mean:
1. There was a population bottleneck such as a mass death event
2. Antigenic drift - changes in prevalence of some gene types due to random chance
im not sure about this, please help explain :( will mark brainliest
A small group of birds became isolated from a large population when deforestation occurred for the development of new buildings. Over the course of a few generations, the gene pool of the small group became drastically different from the original population. Which of the following best describes this occurrence?
A selective process caused an increase in the population's genetic variation.
The founder effect caused the chance event that altered the allele frequency.
Bottleneck effect led to over-representation of certain alleles in the new gene pool.
Gene flow led to an increase in the gene pool's allele frequencies.
I'm thinking it's the founder effect, which according to something I found on the Internet is genetic variation from when a population originates from a small amount of species.
Bottleneck effect led to over-representation of certain alleles in the new gene pool. Therefore, option (C) is correct.
The phenomenon known as the bottleneck effect takes place when a population suffers a significant decrease in size, which leads to a reduction in the amount of genetic variation in the population. In this hypothetical situation, the clearing of land for new construction and the introduction of new structures led to a small group of birds becoming cut off from the larger, original population of birds.
Due to the fact that this small group was kept apart from the larger population, a phenomenon known as a bottleneck effect occurred. This caused the gene pool to become strikingly dissimilar to that of the original population as a result of the overrepresentation of certain alleles in the new gene pool. As a result, the response that should be chosen is option C.
Learn more about The bottleneck effect, here:
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List the layers of Earth’s atmosphere in order of increasing altitude.
A.
troposphere, stratosphere, mesosphere, thermosphere, exosphere
B.
exosphere, thermosphere, mesosphere, stratosphere, troposphere
C.
troposphere, stratosphere, mesosphere, exosphere, thermosphere
D.
stratosphere, mesosphere, thermosphere, exosphere, troposphere
Answer:
A
Explanation:
It is the correct answer
Answer:
The answer is A.
Explanation:
4. You must build a model of an aquifer for a science
project. What material would be the best to use
for the layer that will hold water?
a. an impermeable material, such as clay
b. a liquid, such as oil
c. a permeable material, such as gravel
d. a material that does not have pores
Answer:
I would say A
Explanation:
Which of the following options does NOT affect the rate of diffusion?
1. the distance the molecules must travel to diffuse
2. the characteristics of the barrier that must be crossed for diffusion
3.the characteristics of the substance the molecules are traveling in
4.the temperature of the molecules
5.the surface area and thickness of the cell membrane across which diffusion is taking place
6.all of these options will affect the rate of diffusion
Answer:
4. ....... ...
Explanation:
look at the meaning of diffusion
what is energy?How dose energy work
Answer:
energy is the quantitative property that must be transferred to an object in order to perform work on, or to heat, the object. Energy is a conserved quantity; the law of conservation of energy states that energy can be converted in form, but not created or destroyed.
How are meiosis and mitosis different?
Answer:
Function. Mitosis is for the growth, development, repair of damaged cells and replacement of damaged cells in multi-cellular organisms. Meiosis is the production of gametes for sexual reproduction.
Location it takes place in. Mitosis takes place in all somatic cells! Meiosis takes place in the testes and ovaries. (In humans)
Number of daughter cells produced by a single parent cell. Mitosis produces 2 daughter cells from 1 parent cell. Meiosis produces 4 daughter cells from 1 parent cell.
Number of chromosomes each daughter cell contains. In mitosis, each daughter cell contains a diploid number of chromosomes. (2n) In meiosis, each daughter cell contains a haploid number of chromosomes. (n)
Presence of crossing over stage in Prophase. In mitosis, there is no crossing over (homologous recombination) that occurs in Prophase. In meiosis, there is crossing over (homologous recombination) that occurs in Prophase.
Genetically identical to parent cells? In mitosis, daughter cells are clones of their parent cell. Hence they are genetically identical to each other. In meiosis, daughter cells are genetically different to their parent cells as they contain different genetic codes due to crossing over that had led to the recombination of genes between homologues during Prophase I.
Genetically identical to daughter cells? In mitosis, daughter cells are clones of each other. Hence they are genetically identical to each other. In meiosis, daughter cells are genetically different to other daughter cells as they contain different genetic codes due to crossing over that had led to the recombination of genes between homologues during Prophase I.
5. Which of these animals hibernates through the cold winter?
A. White-tailed deer
B. Black bear
C. wild boar
D. Turkey
black bear
hope it helps you
....
4. Which could harm human health?
HE.7.C.1.3
A compost
B hazardous waste
© nitrogen
D reclamation
Answer: Hazardous waste.
Explanation: Hazardous waste is dangerous for our health because it can make us sick or even kill us! Hazardous waste gets poured out on rivers that kill or make the fish sick. When humans fish and eat it, they're eating the waste and that can make them sick.
Transcribe the DNA strand into
mRNA
Section it into its codons
Translate it into amino acids. TACTTTAGCGATACT
Answer:
AUGAAAUCGCUAUGT
Explanation:
T = A
A = U
C = G
G = C
The tilt of Earth affects the length of
in any particular area.
1. The Moon
2. Shadows
3. Daylight
These types of cells are found in the reproductive organs and are called?
Answer:
gametes should be the answer.
Explanation:
Answer:
gametes (GAH-meetz), are involved. The male gamete, or sperm, and the female gamete, the egg or ovum, meet in the female's reproductive system. When sperm fertilizes (meets) an egg, this fertilized egg is called a zygote (ZYE-goat).
Explanation:
High-altitude cirrus clouds are primarily formed from which substance?
A.
ozone molecules
B.
nitrogen compounds
C.
carbon dioxide gas
D.
solid ice crystals
Answer:
D. Solid Ice Crystals
Explanation:
"Cirrus clouds are wispy, curly, or stringy. They are found high in the atmosphere—typically higher than 6,000 meters (20,000 feet)—and are usually made of ice crystals." -National Geographic
which organ of the female reproductive system produces milk?
Answer:
The mammary gland
Explanation:
The mammary gland is a gland located in the breasts of females that is responsible for lactation, or the production of milk.
Hope this helps!
Answer:
The breast
Explanation:
The breasts are organs of the female body that contains milk ducts, adipose tissue, and mammary glands. The two breasts are located on the left and right sides of the thoracic region or upper ventral region of the body. In the middle or hub of each breast is a nipple, which is highly pigmented and releases milk when stimulated.
1) Which letter indicates the most gradual change in temperature?
2) Which letter indicates the most sudden change in temperature?
Answer:
Don't know... sry .. But, I think I) C , 2) K
Which species do you think is the best adapted to a diet of small, delicate seeds? explain why you think so
Which species do you think is the best adapted to a diet of large, tough-to-crack seeds? Explain.
Answer:
the second bird below the first one
Explanation:
birds need a big beak to crack shells while some need small ones to eat small seeds.
4. Explain the role played by non-governmental organizations in international environmental policy.
Answer:
★ They exert influence over international environmental policies
Explanation:
Hope you have a great day :)
SOMEONE HELP ME ASAP
Answer:
B or d
Explanation: Diffrent events or colors can also show a pattern while sets of numbers can too
The organisms that are most likely present in the largest numbers are
А
Microscopic algae
B
Herring gull
С
Crab
D
Common seals
Answer:
Microscopic algae should be the answer
How are "seasonal" fresh fruits and vegetables readily available 365 days a year?
Drag each item to the correct location to show when each occurred.
Which statement is FALSE?
There is evidence that the Bertillon System was used in ancient Egypt, India, and
China.
The Bertillon System was used in the United States and Europe before fingerprinting
replaced it
The Bertillon System is no longer used today by law enforcement
In the Bertillon System, sets of measurements were taken of each criminal, and
thought to be unique
Answer:
The statement that is false would be the third answer.
Explanation:
Sorry if this is wrong. I was doing my best.
Answer:
Option third is false.
Explanation:
Alphonse Bertillon in the later 18th century developed a system of solving crimes through a standardized process of bodily measurements, photographs, footprints, impressions, and thumbprints which created a unique identification of every criminal. The system gained popularity and acceptance in no time and various countries around the world accepted it as a part of law enforcement. Earlier, law enforcement was largely dependent on the Bertillon system to establish identity but with the advancement of science and introduction of fingerprinting this system was replaced by fingerprinting.Although, some of the methods of the Bertillon system are still part of the forensic methods of solving crimes while anthropometry was discarded.For more information:
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Veins transport ____ blood.
fill in the blank please
Answer:
Veins transport Deoxygenated blood
Gamma rays are formed on Earth by natural
radioactive decay, nuclear explosions, and _?_ in
thunderstorms.
Answer:
lightening
Explanation:
its lightening
what are the sequence of events in the replication of DNA
Answer:
There are three main steps to DNA replication: initiation, elongation, and termination. In order to fit within a cell's nucleus, DNA is packed into tightly coiled structures called chromatin, which loosens prior to replication, allowing the cell replication machinery to access the DNA strands.
What is needed in order to give the DNA polymerase a place to start copying DNA? How long is it? What puts it on?
List the four locations for the sensors that control breathing rate.
Answer:
Dorsal respiratory group – inside of the medulla.
Ventral respiratory group – inside of the medulla.
Pneumotaxic center – various nuclei of the pons.
Apneustic center – nucleus of the pons.
Explanation:
=)
Explain A wood frog species in Alaska can survive being frozen
almost completely solid. In spring it thaws and becomes more
active. Wood frogs that live in warmer climates do not have this
trait. Explain how this trait relates to adaptation and speciation.
Wood frogs are found in the United States throughout the forests of Alabama and Northwest into Idaho. Wood frogs are the only frogs that live North of the Arctic Circle. Adults usually live in woodlands and lay in vernal pools.
Wood frogs live in a variety of habits, from forests to bogs to tundra. They hibernate on land and breed in water.
The Wooded frog does adapt in warmer climates by hibernating by nestling down into the leafy litter on the forest floor.
I majored in Biology
Do you have a summative in Grade 9 science?
Answer:
check with your teacher
Answer:
yes I have
Explanation:
why did you ask