When observing the skeleton of a snake, you see the remains of hip and hind leg bones associated with four legged animals. These bones are called ...
A. convergent traits.
B. analogous structures.
C. vestigial structures.
D. homologous structures.
E. both homologous and analogous structures.
C. vestigial structures.
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Land plants are descended from ____
Fill in the blank with the appropriate word.
Molecules or regions of molecules that readily interact with water are said to be ________, whereas molecules or regions of molecules that are insoluble in water or do not readily interact with water are said to be hydrophobic.
Fill in the blank(s) with the appropriate word(s).
An animal with a gastrointestinal tract is the ___________.
A. jellyfish B. planarian C. hydra D. sponge E. earthworm
A directional adjustment of growth in response to environmental stimuli is called ____
a. circadian rhythm b. vernalization c. photoperiodism d. statolith e. tropism