Which characteristic is common to both segmented worms and flatworms? A. Segmented body
B. Front end and a back end
C. Long slender round body
D. A flat body

There are six elements that make up most of the human body. which of the following is not one of these six elements?

The following image is of a diatom. it lives in water and gets food from photosynthesis. it is encased in a hard shell made of something similar to glass or sand . a diatom is a(n) because it has a) multi-celled organism; specialized parts. b) vertebrate; a skeleton. c) insect; an exoskeleton. d) single-called organism; only one cell.

Hairs that clean dirt out of the air in your nasal passages are called: a. sinus b. trachea c. cilia d. mucus