Topsoil is the most fertile soil layer for plants.
Answer:
HeLa cells have been used in research to study
Explanation:
the nature and progression of cancer
Answer:
H. pylori (Helicobacter pylori) is a bacteria that maintains homeostasis of the human body by establishing chronic infection from ulcers and gastritis and using the method of autophagy to cleanse the body of damaged cells. H. pylori also contributes to the workings of the immune defense system.
Answer:
hereditary variat on selection is made of those genetic variats that well be passed on most effectively to the following generation
