Answer:
This isn't biology LOL. But "the implementation of the American policy of westward expansion."
Explanation:
Answer:
Infectious diseases are diseases caused by living organisms like viruses and bacteria. They can be passed from person to person through body secretions, insects or other means. Examples are SARS, influenza, the common cold, tuberculosis (TB), Hepatitis A and B.
D. The remains of living things
Fossils are the remains of living things
Acidic groundwater dissolving limestone