Almost all animals share the following characteristics except

A. cell walls.

B. diploidy.

C. heterotrophy.

D. mobility.

The correct answer is A.

Animal cells do not have a cell wall.

A cell wall is the rigid, outermost covering of plant cells and is made up of cellulose. It is absent in animal cells. The cell wall is visible under a light microscope.

Animal cells are instead covered by a cell membrane. It is made up of lipids, proteins, and small amounts carbohydrates. It is a thin and delicate structure that can only be seen using an electron microscope.

Almost all animals share the following characteristics except cell walls.

Answer: A

Only plant cells contain cell walls.