Explanation:
Genetic variation can be caused by mutation (which can create entirely new alleles in a population), random mating, random fertilization, and recombination between homologous chromosomes during meiosis (which reshuffles alleles within an organism's offspring).
Answer:
The answer is Mutation.
Explanation:
Based on the timeline for the succession of a beech-maple forest in the previous question, infer the amount of time that this restoration project has been occurring.
Answer:
Chicago’s biome is not a beech-maple forest; it is grassland. When the restoration project reaches its climax community will there be any trees? Draw what you think the climax community at Osterman Beach will look like.
Explanation:
What part of the digestive system first causes chemical changes to food?
A. teeth in the mouth
B. saliva in the mouth
C. enzymes in the stomach
D. enzymes in the small intestine
Answer:
b. saliva in the mouth
Explanation:
saliva contains enzymes that help break down food
Saliva in the mouth causes the first chemical changes in the food. So the correct option is B.
What is saliva?Saliva is a continuously present, viscous, colorless, opalescent fluid in the mouths of humans and other animals. It is made up of amylase, water, mucus, proteins, and mineral salts.
Saliva takes up food particles, bacterial cells, and white blood cells as it moves about in the oral cavity. Every day, a person's mouth excretes one to two liters of fluid.
The total amount of saliva is produced by three primary pairs of salivary glands as well as numerous smaller glands that are dispersed across the has included of the cheeks, lips, tongue, and palate.
The mouth naturally produces small amounts of saliva on a regular basis, but the introduction of food, or even just the scent or idea of it, will significantly enhance saliva production.
Salivation serves a variety of purposes. In order to aid in speaking and transform foodstuffs into a liquid or semisolid material that can be tasted and taken more readily, it primarily lubricates and moistens the interior of the mouth.
Therefore the correct option is B.
Read more about saliva, here
https://brainly.com/question/8286678
#SPJ5
What is lost when a forest is removed?
No links please.
Answer:
When forests are cut, burned or otherwise removed they emit carbon instead of absorb carbon.
Explanation:
Deforestation and forest degradation are responsible for around 15% of all greenhouse gas emissions.
which of the following correctly pairs the reproduction with cell the process or processes that are directly involved
1. A. asexual reproduction; mitosis and meiosis
2. B. asexual reproduction; meiosis
3. C. sexual reproduction; mitosis and budding
4. D. sexual reproduction; meiosis
Answer:
d
Explanation:
amino acid is to protein as _____ is to dna
Compare the exponential model and the logistic model of population growth. NEED FOUR SENTENCES
Answer:
When the resources are infinite (cyclic), the population exhibits exponential growth, resulting in a J-shaped curve ... In logistic growth, population expansion decreases with the scarcity of resources. It turns off when the carrying capacity of the environment is reached, resulting in an S-shaped curve.
Finn listed two of the three steps involved in gene therapy. 1. The normal allele is removed from the chromosome. 2. The normal allele is added to the cells of a person with the disorder. Which step should he also include, and where?
Answer:
The unhealthy gene sequence is cut from the DNA before 2
Explanation:
Gene therapy refers to genetic engineering techniques aimed at introducing exogenous nucleic acids (either DNA or RNA) into the patient's cells in order to restore gene function. Gene therapy techniques hold a great promise to treat genetic diseases and disorders. Gene therapy may involve replacing defective genes with a functional copy of the gene of interest within the desired cells. For this purpose, it is required to use a DNA-specific damaging agent to knock out the defective gene and subsequently restore normal gene function by inserting a functional gene sequence into the recipient cells. Gene therapy techniques can be divided regarding target cells into 1-somatic gene therapy, where genetic modifications are applied on somatic body cells (and therefore they are not inherited by offspring), and 2-germinal gene therapy, where genetic modifications are applied on germinal cells (i.e., gametes) or undifferentiated stem cells (and therefore genetic changes may pass to the following generations).
Answer:
The unhealthy gene sequence is cut from the DNA before 2
Explanation:
how can you add a normal one if one is still infected it would be pointless not to take it out
Which of the following describes the location of the polar climate zone?
1. Between the tropical and the temperate zones
2. Farthest from the equator
3. From away from the north pole and south pole
4. Closest to the equator
Answer:
closest to the equator because the equator divides our planet into the northern and southern hemisphere and is located at 0° latitude but halfway line between the North and South Pole which would be near the more arctic areas
Answer:
a
Explanation:
On a microscopic scale, the energy change in a system is described by a ___________
a. A change in color or texture
b. Measuring the temperature
c. A chemical equation
d. An odor
Answer:
the answer is c a chemical equation
Here is a model of Earth's yearly orbit around the Sun. In this model, the names of the seasons apply only to the northern hemisphere, Seasons in the Northern Hemisphere Equinox March 20 or 21 Solstice June 20,21, Spring Winter Summer Autumn Solstice December 21 or 22 Equinox s September 22 or 23 Examine the model, and think about how it would be different for the southern hemisphere. What causes the southern hemisphere to experience summer? A. Earth's north pole is tilted toward the Sun. B. Earth's axis and its equator are at different angles. C. Earth's axis and its orbit plane are at different angles. D. Earth's south pole is tilted toward the Sun.
Answer:
D
Explanation:
Answer:D
Explanation:
Please help me if you know the answer please
what might happen to the finch populations after millions of years?
Answer:
please give me brainlist and follow
Explanation:
The finches of the differing islands would evolve to match their habitat so much that the two may noteven be alike.
Answer:
Finch populations will start to dwindle.
Explanation:
Finch's like all animals will start the process of evolution themselves becoming new types of subspecies.
Help!
Anteaters have sticky tongues to help them catch insects.
What type of adaptation is this?
A. Learned
B. Structural
C. Respiratory
D. Behavioral
Answer:
B (Structural)
Explanation:
They are born with their tongue.
What is index of refraction and what does it have to do with the speed of light?
Answer:
Index of refraction is the ratio of the velocity of light in medium to the velocity of light in vacuum.
OR:
Index of refraction is the ratio of the sine of the angle of incidence to sine of the angle of refraction of light propagating from one medium to another.
When the refractive index is greater, the speed of light is greater as it moves from the medium to vacuum.
List 3 main types of weather
ering
What two diseases have been studied together that provide evidence of evolution in
humans?
A)malaria and ebola
B)sickle cell anemia and malaria
C)cytochrome c disease and plasmodium fever
D)iron-deficient anemia and yellow fever
Answer:
sickle cell anemia and malaria
Explanation:
Scientists believe the sickle cell gene appeared and disappeared in the population several times, but became permanently established after a particularly vicious form of malaria jumped from animals to humans in Asia, the Middle East, and Africa.
The two diseases have been studied together that provide evidence of evolution in humans is sickle cell anemia and malaria.
What is sickle cell mutation?
The sickle cell mutation is relevant to malaria because infection of a red blood cell with the malaria parasite leads to hypoxia. In individuals of the AS genotype such blood cells sickle and are then eliminated by macrophage cells of the body’s immune system, lessening the burden of infection (Luzzatto, 2012). Carriers of the sickle cell trait are particularly resistant to severe malarial episodes; they are less resistant to mild cases. The mechanism by which carriers are protected from malaria is different than the acquired immunity that both AA and AS individuals achieve following repeated exposure to the disease.
The benefit that possessing a single copy of the sickle cell gene conveys counterbalances the biological cost incurred when homozygous SS children are stricken with sickle cell disease. An individual of the AS genotype is more likely to reach adulthood than is an individual of the AA genotype, but the former is also more likely to see his/her child die of sickle cell disease. This is known as a heterozygote advantage or balanced polymorphism. As shown more formally below, the stronger is the pressure of malaria on survival, the more advantaged are individuals who carry the S gene, and in equilibrium, the higher the percentage of the population who will be carriers. Indeed, it was the correlation of high prevalence of the sickle cell gene and the presence of malaria that first led scientists to understand the protective role of the sickle cell mutation (Kwaitkowski, 2005). As will be seen in the next section, the underlying genetic mechanism by which the sickle cell trait is transmitted provides a means of mapping sickle cell prevalence into an estimate of the mortality burden of malaria.
Learn more about cell mutation
https://brainly.com/question/17031191
#SPJ2
from the moment a message is sent to astronauts on the moon it take at least 3 seconds to reply because
Plz help
Answer:
its D) it takes time for electromagnetic radio waves to get to the moon because of its large distance from earth.
Explanation:
Which type of fertilization and development occurs
in the life cycle of the organisms represented below?
Explain what would occur if the population of an animal such as a beaver, changes the environment and can increase the number of individuals in that area. In other words, explain how a change to an environment can cause an increase in an animal population.
Your answer:
Hammed has 200 stamps. 35% from Europe, 10% from Asia , 20% from Australi The rest of the stamps from North America. How many of Hammed's stamps are from North America?
Answer:El 35% es de America del Norte
Explanation:
Answer:
135%
Explanation:
Given
Europe = 35%
Asia = 10%
Australia* = 20%
North America = ?
To find
Europe + Asia + Australia =
35% + 10% + 20% = 65%
Then the total subtracted from the given
200 - 65 = 135
Therefore,
North America = 135%
Confirm
To make sure that is the correct answer, add it all together.
35 + 10 + 20 + 135 = 200
Which means it is correct.
True or False: Births, deaths and migration do not factor into changing the size of a population...
Answer:
False I believe
Explanation:
HELP answer only if 100% sure you think that is the correct answer.
Answer:
First picture
● C.
Second picture
● B.
Third picture
● I think C.. sorry but the picture is so blurred!
Fourth picture
● A.
Fifth picture
● A.
[tex]\color{yellow}{}[/tex][tex]\color{yellow}{}[/tex][tex]\color{yellow}{}[/tex][tex]\color{yellow}{}[/tex][tex]\color{yellow}{}[/tex][tex]\color{yellow}{}[/tex][tex]\color{yellow}{}[/tex][tex]\color{yellow}{}[/tex]
Answer:
1stPicture= Option C
2nd Picture=Option B.
How can we stop the amount of emissions that contribute to greenhouse gases?
When a living thing changes in response to a change in seasons, it is called a ________.
A. Behavioral change
B. Physical change
C. Natural change
D. Seasonal change
Literally my idiotic sister insists on using my account to ask this-
Answer:
D. Seasonal change............. It legit says "change in seasons" in the question.
3. Which of the following best describes Earth conditions during the Hadean?
A) covered with glaciers
B) hot with lots of volcanoes
C) cold and dry
D)active with many types of life
Answer:
b
Explanation:
B
Answer:
B) hot with lots of volcanoes
Explanation:
The Earth was very hot during the Hadean and did not yet have an oxygen rich atmosphere.
PLSSS HELPPPP I WILLL GIVE YOU BRAINLIEST!!!!!! PLSSS HELPPPP I WILLL GIVE YOU BRAINLIEST!!!!!! PLSSS HELPPPP I WILLL GIVE YOU BRAINLIEST!!!!!! PLSSS HELPPPP I WILLL GIVE YOU BRAINLIEST!!!!!!PLSSS HELPPPP I WILLL GIVE YOU BRAINLIEST!!!!!! PLSSS HELPPPP I WILLL GIVE YOU BRAINLIEST!!!!!! PLSSS HELPPPP I WILLL GIVE YOU BRAINLIEST!!!!
Answer:
Schwann - animals are made of cells
Virchow - cells divide
Schleiden - plants are made of cells
Hooke - recognized living cells
Leeuwenhoek - observed cells and coined the term "cell"
Brainliest please! :)
The external openings of the airway include which of the following features? (multiple answers)
mouth
lungs
alveoli
nose
diaphragm
Answer: mouth, nose
Explanation:
Please only respond if you know the answer. Also, links will be reported
Answer:
A. They would no longer be able to photosynthesize because carbon dioxide is a reactant in the process.
Explanation:
Carbon dioxide is needed for plants to photosynthesize to be able to exchange gases as they will take in carbon dioxide from the atmosphere and give out oxygen into the surroundings.
What is the relationship between DNA mutations and the disorders? Disorders:Hemophila,Beta thalassemia, and Sickle Cell Disease
Answer:
disorders are caused by mutations of these genes
Explanation:
Que tedria de particular la retina de un animal que no pudiera diferenciar los colores cuya vision fuera exclusivamente en blanco y negro
Answer:
La falta de células cono en la retina
Explanation:
En vertebrados, la retina se encuentra formada por dos tipos básicos de células denominados células conos y células bastones. Las células cono son unas células fotosensibles las cuales forman una capa concentrada en el centro de la retina. Estas células (células cono) son responsables de la distinción entre diferentes colores del espectro de luz visible. Las células cono se clasifican en tres tipos de acuerdo a su sensibilidad para distinguir la luz azul, roja, y verde. Esta sensibilidad se debe a la presencia de diferentes tipos de proteínas opsinas, las cuales confieren la capacidad de absorber la luz en una longitud de onda particular: cianopsina (sensible a la luz azul), eritropsina (sensible a la luz roja) y cloropsina (sensible a la luz verde). Animales como los gatos y los perros son daltónicos, es decir, no pueden completamente diferenciar los colores, debido a la falta de una o más clases de células cono (y por lo tanto también de opsinas) en la retina.