The pump in a circulatory system is called the Choose...
. In vertebrates, its chambers include at least one
Choose...
, which receives the blood, and at least one
Choose...
, which pumps the blood to other body organs.

What are four key elements of the study of economics?

There are six elements that make up most of the human body. which of the following is not one of these six elements?

Which statement is the best summary of the model? a-a series of aerobic and anaerobic reactions take place in cells b- the sun's energy moves through trophic levels in a food chain c-light energy is converted into stored chemical energy plants.d- food molecules are broken down in the cells if living things.