An animal with bilateral symmetry

a. have a distinct head end.

b. have no definite shape.

c. can only move in one direction.

d. all live in water

A. Have a distinct head end

Explanation:

Many animals have symmetrical bodies, this means that it could be divided into matching halves by drawing a line down the center. This symmetry can be bilateral (left and right half are mirrored), radial (lines meet in the middle, dividing it up) or nonexistent (their bodies cannot be divided into similar halves with a straight line).

Bilateral or two-sided symmetry is the most common, animals with this kind of symmetry have a dorsal (top) side, a ventral (bottom ) side, an anterior (head) end, a posterior (tail) end, and a distinct left and right side.

Symmetrical organisms are directionally sensitive and mobile, the anterior end is the first to encounter food, danger, or other stimuli, an example of this kind of animals are butterflies ans spiders.

Considering this infomation we can conclude that these kind of animals can move in different directions and they don't live only in the water, since they're symmetrical they also have a definite shape, therefore the correct answer is that they have a distinc head end.

I hope you find this information useful and interesting! Good luck!

oxygen = 21% of the atmosphere

nitrogen = 78%

carbon dioxide = 0.1%

argon =0.934%