Which of the following is true about traits?

A. They refer to external appearances only.

B. They refer to internal appearances only.

C. They can refer to a change in the skeletal or
muscular system.

D. We cannot observe traits.

What are tissues? a groups of tissues that work together b basic units of structure and function c groups of cells that perform the same function d multiple organs that perform a major function

How are gross production and net production different? a. net production is always greater than gross production. b. net production is always less than gross production. only animals have net production. d. only plants have net production. select the best answer from the choices provided

18. which statement about cancer is true?