Lymph nodes enlarge during an infection because
a. they become infected.
b. lymphocytes destroy invaders inside of them.
c. they become clogged due to infections in the blood.
d. the body produces double the amount of lymph.
e. blood oozes into the nodes.
B
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Why do crossing over and independent assortment occur during meiosis?
a. to increase genetic diversity b. to decrease genetic diversity c. to increase cell production d. to decrease cell production
Analogous structures form because:
a. they are forms of mutation. b. they evolve as a response to similar environmental pressures. c. they only occur as errors. d. they share a similar genetic origin.
Before the evolution of photosynthesis, early cells extracted energy from ____
a. oxygen b. ATP c. NADPH d. water e. methane
©McGraw-Hill EducationConsider the cladogram shown. Based on this cladogram, which species has the greatest number of ancestral character states (pleisiomorphies)?
A. 1 B. 2 C. 3 D. 4 E. 5 F. 6