Look up Dawrin's theory of evolution. Basically, fossil records show how life forms change over time through evolution.
here are the structures i hope it helps
Answer:
primary, secondary, tertiary, and quaternary.
A cell which contains cytoplasm, cell membrane and a nucleus
In low light no plants grow. With no plants no animals can eat so less animals remain or stay there. With less animals less animals respire and breathe out CO2.