An organism must have a in order to be considered living.
as a sunflower grows, it bends toward the sun's light. this is an example of
a. reproduction.
b. response to a stimulus.
c. artificial selection.
d. a controlled experiment.

What is the best-known carbohydrate?

What do all macromolecules have in common with each other? oa. they all are formed from the same elements.ob. they all have major roles in cell membranesoc. they all act as catalysts in the body.od. they all have peptide bonds between carbon atoms.

What type of appendages do sponges cnidarians roundworms annelids mollusks arthropods echinoderms and vertebrate have? jointed, not jointed, absent