What are the two main types found in humans?

The model illustrates a process by which a substance is taken up by a cell

Adigestive system that is a series of tubes beginning at the mouth and ending at the anus is a digestive system.

Plz ! a scientist wants to produce a cow that makes a particular human protein in it’s milk the desired protein causes blood to clot and can be used to treat hemophilia (a blood clotting disorder). which of the following would be best for the scientist to use? a. genetic crosses. b. cloning. c. selective breeding. d. genetic engineering.