In the open-water region of freshwater lakes, the ________ zone lacks sufficient light for photosynthetic organisms
Fill in the blank(s) with correct word
profundal
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Respiration by means of book lungs is characteristic
of some a. flatworms. b. arthropods. c. annelids. d. mollusks. e. gastropods.
Fossil evidence indicates that horses have gradually increased in size over geologic time. Which of the following terms best describes this?
A) artificial selection B) directional selection C) stabilizing selection D) disruptive selection E) sexual selection
Which of the following contains indigestible fiber, mucus, and dead microorganisms that are eliminated from the body?
A) Ghrelin B) Pancreatic juice C) Bile D) Chyme E) Feces
What stimulates germination of desert plant seeds after a hard rain?
A) production of auxins B) removal of abscisic acid C) cooler temperatures D) activation of cytokinins