Abird’s air sacs enable it to obtain fresh oxygen when it both inhales and exhales.

true
false

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.

How do accessory pigments chlorophyll?

In this case, the statement that people who exercise for an hour may have lower cholesterol levels is .