How are the circulatory systems in animals and plants alike? a. all plants and animals have a heart. b. their circulatory systems move blood throughout the organism. c. their circulatory systems transport nutrients to cells. d. both plants and animals have a pulmonary circuit.

How was the climate when the ambulocetus was alive

The gene that causes sickle-cell disease is present in a higher percentage of residents of sub-saharan africa than among those of african descent living in the united states. even though this gene causes sickle-cell disease, it also provides some protection from malaria, a serious disease that is widespread in sub-saharan africa but absent in the united states. discuss an evolutionary process that could account for the different percentages of the sickle-cell gene among residents of the two regions.

Wich of the following are manual restraint techniques for dogs