Answer:
a pure substance because it cant be divided/ separated into parts
Forests and other green plants uses carbon dioxide in photosynthesis thus lowering its amount in the atmosphere. In assumption, we can claim that in the ice ages, the low level temperatures may have caused the carbon dioxide levels to neutralize over these phenomenons, also to note that there were less oxygen-breathing organisms and higher carbon-dioxide dependent performing photosynthesis.
Chromosomes and autosomal or somatic cells
I picked the hawk, because it is at the top of the pyramid and the farther up in the food pyramid the less energy from the sun it gets
