Answer:
In biology, evolution is the change in the characteristics of a species over several generations and relies on the process of natural selection. The theory of evolution is based on the idea that all species? are related and gradually change over time.
Answer:
not enough clean oxygen being produced for us to breathe, loss of habitat for countless species causing them to possibly go extinct.
Answer:
I believe its muscle cell, muscle tissue, stomach
Explanation:
The order for organ systems from least complex to most complex is: Cell, tissue, organ, organ system. Hope this helps
