Parent material, organic matter, sand, silt, clay, water
I am inclined to say 1. core and mantle... but im not entirely sure...
sorry not much help at all!
Answer:
Mammals, insects, fish and plants all have different systems of exchanging gas. For mammals we breathe into our lungs, for fish they use gills and insects use spiracles.
Explanation:
hope it kind of helps sorry if it doesn't
b is the right answer because we breathe oxygen and when we breathe out we let out carbon dioxide
