There are about ____ identified species of vertebrates
a. 2,000
b. 5,000
c. 30,000
d. 50,000
e. 125,000
d
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CO2 is an example of a ____ , a gas that is present in the atmosphere and can absorb solar radiation re-emitted from the Earth's surface
Fill in the blank with the appropriate word.
The phenotype of a person with alpha thalassemia depends on the
A) number of beta globin genes. B) presence or absence of a sickle cell mutation. C) number of alpha globin chains. D) rate of replication of the alpha globin genes.
Which of these membrane transport processes does not require membrane proteins?
A. osmosis B. facilitated diffusion C. active transport pumps D. endocytosis E. All of the answer choices are correct.
A person using a very effective sunscreen would be less likely to make which vitamin within his or her body?
A) vitamin A B) vitamin B C) vitamin C D) vitamin D