It has been proposed that mitochondria and chloroplast are modern descendants of early prokaryotic cells that began to reside and gradually evolve in with primitive cells

How is the male reproductive system different from other body systems? it isn’t necessary to vital signs. it monitors other body systems, and adjusts if necessary. it transports items from one system to another. it is the only system that produces hormones in the male.

The most effective way to provide children with safety messages is to

Which of the following molecules could pass through the plasma membrane by simple diffusion? a. na+ ions b. glucose c. amino acids d. carbon dioxide