Answer:
Explanation:
common warts are actually an infection in the top layer of skin, caused by viruses in the human papillomavirus, or HPV, family. When the virus invades this outer layer of skin, usually through a tiny scratch, it causes rapid growth of cells on the outer layer of skin – creating the wart
The purpose of cutting a frog heart it too relate how the heart structure is. It is just a small scale of the human heart.
The answer you are looking for is Natural Selection.
