Compare the lymphatic system with the cardiovascular system

What word is used to describe differences of individual organisms

What protects the lining of the stomach from acidic gastric juices?

The diagram shows a fossil of an ancient whale skull and a skull of a present-day whale. the ancient whale is extinct and is believed to be an ancestor of the present-day whale. what do these skulls most likely show that supports darwin’s theory of evolution? all populations can adapt and survive. only some organisms have a common ancestor. populations change slowly over time. populations rapidly become extinct.