Blood is a connective tissue composed of red blood cells, white blood cells, and blood platelets. why is it that we can see blood cells only with a microscope?

Describe how an electric generator works

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.

Q: a: in sexually reproducing animals, once fertilization of the egg takes place, the exists as a single cell until cell division begins