Scientists began to question the perfection of the “great chain of being” partially because of their studies in ____
a. radiometric dating
b. uniformity
c. meteorology
d. astrobiology
e. comparative morphology
ANSWER: e
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The final step in the development of eukaryotic cells was likely ____
a. duplication of function in the endosymbiont and host cell b. transfer of genes and function from the endosymbiont to the host cell c. circularization of DNA d. formation of membrane-bound organelles
e. ingestion of photosynthetic bacteriaGreenhouse gases __________ the escape of heat
energy by absorbing the energy of __________ wavelengths of light, and radiating much of it __________ Earth. a. enhance; longer; back toward b. enhance; infrared; back toward c. impede; infrared; back toward d. enhance; longer; away from e. impede; shorter; back toward
Which pairing of nerves and functions is part of the peripheral nervous system?
A. somatic nerves; flight-fight response B. autonomic nerves; control skeletal muscle C. autonomic nerves; control internal organs D. parasympathetic neurons; prepare body for danger E. sympathetic neurons; housekeeping tasks in the body
Ovulation is triggered by ____
a. high levels of LH b. low levels of LH c. low levels of estrogen d. high levels of estrogen e. high levels of progesterone