Which vessels allow an actual gas exchange?
a. the capillaries
b. the venules
c. the arterioles
d. the veins
Ans: a. the capillaries
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Fraternal twins arise from two different fertilized eggs and are called ____ twins
Fill in the blank with the appropriate word.
Two hydrogen atoms (atomic number 1 ) form a covalent bond. Which of the following is true?
A) Both hydrogen atoms now have two protons in their outer shell. B) One hydrogen atom now has zero electrons in its outer shell, and the other has two. C) Both hydrogen atoms now have two electrons in their outer shell. D) Each hydrogen atom still has one electron in its outer shell. E) One hydrogen atom now has zero protons in its outer shell, and the other has two.
Entomopathogenic nematodes can kill insects because of their symbiosis with
a. fungi. b. protozoa. c. bacteria. d. all of the above.
What is the coefficient of relatedness for individuals A and B in the following pedigree?
a. 0.5 c. 0.125 b. 0.25 d. 0.0625