In biology, what are the two of the most important types of reactions?

Wht happens as electrons in the electron transport chain release their energy

The diagram shows a fossil of an ancient whale skull and a skull of a present-day whale. the ancient whale is extinct and is believed to be an ancestor of the present-day whale. what do these skulls most likely show that supports darwin’s theory of evolution? all populations can adapt and survive. only some organisms have a common ancestor. populations change slowly over time. populations rapidly become extinct.

Describe how a student should adjust the microscope to see the cells on a slide more clearly?