Answer:
b
Explanation:
a compond is and atom from more than one element held together by chemical bonds
<span>Both chloroplasts and cyanobacteria perform photosynthesis. They also share many characteristics, including an inner and outer membrane, a nucleoid, thylakoids, lipid droplets and ribosomes. These similarities lead to the suggestion chloroplasts evolved from cyanobacteria.</span>
Answer:
C. Oxygen concentration decreases as altitude increases
Explanation:
Higher altitudes have lower levels of oxygen and decreased air pressure.
Three percent is freshwater found in glaciers and ice, below the ground, or in rivers and lakes.