I think homologous structures is a great example and idea that supports the theory of evolution. Homologous structures shows us how our futures evolved by natural selection.
In ancient times, people classified plants and animals by use. Like for plants they are being classified as beneficial or harmful. While for animals, they are classified as domestic animals, wild animals, creeping animals, flying animals, and sea animals.
Energy in organisms is homeostasis cells I believe
The answer to this question would be Fermentation. This is a process that releases energy when oxygen is insufficient.
B. animals do not have chloroplasts.
