The work done by the heart is often compared to that of. a pump. this is because our heart also uses blank to keep blood flowing through our body

'which of these statements about the scientific method is not true? all experiments must follow the same number of steps in the procedure. experiments may be repeated several times. some unexpected results can be beneficial. experimental results may or may not support the hypothesis.

2. sketch the inside of the bean nodule, and describe or label what you observed with the hand lens.

Which characteristics are typical of a human population in the postindustrial stage?