Multicellular life appeared about 1 billion years ago name the eon that corresponds to this​

What does all of the organ system in a human form

Urgent. the table shows the relative blood flow through some organs in the human body that is, the percentage of blood that flows through a given organ, through which organ(s) does all the blood flow? explain the effect of exercise on blood flow to skeletal muscles.

When a gasoline engine burns gasoline, what type of chemical reaction is occurring?