Which of the following components of the blood contains antibodies? a. red cells b. white cells c. platelets d. plasma

Blood has traveled from the heart to the toes. which describes the next step of the circulation process?

Match each symbol with its description.

The greenhouse effect a. something that has occurred for millions of years b. an unnatural phenomenon caused by humans that maintains earths temperature range. c. the results of the differences in the angle of the suns rays d. an unnatural phenomenon that causes heat energy to be radiated back into the atmosphere