Argon
oxygen
nitrogen
carbon
dioxide and
trace gases
this chart shows the compounds
the right is an expanded view of the sma
chart. what percentage of air is oxygen
s the compounds that make up the air. the rectangle on
nded view of the smallest, black wedge of the pie
a
0.07%
b
0.93%
c 21%
d 78%

The correct answer here is C, or 21%.

Explanation:

I have this on my online major test, and it's marked right! :]

Adaptations are special features that allow a plant or animal to live in a particular place or habitat. These adaptations might make it very difficult for the plant to survive in a different place.