3. Which statement about smooth muscle is true?
a. It is arranged in bundles.
b. Its contractions are voluntary.
c. It is needed for the digestion of food.
d. It is found in the walls of all internal organs.

one characteristic that is shared by all is a soft body. many

of these invertebrate animals also have an outer shell to protect their

body. oysters, clams, snails, and mussels are all mollusks. so are octopuses, squids, and slugs. mollusks live on land and in freshwater.

the answer is d (apex) good luck : ))