Which of the following conditions characterizes atmosphere ill?
-nitrogen-rich and oxygen-poor
- hydrogen- and helium-rich
-nitrogen- and oxygen-rich
-water vapor- and carbon dioxide-rich

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 many cells are our body made of ? ♡

When explaining dominant and recessive traits to a younger family member, they respond, "well chances are i can probably taste ptc, since dominant traits are more common." how might you address this misconception?