Mutations are changes in the DNA of an organism. Examples of beneficial mutations include HIV resistance
Answer:
The force that holds the gases in the sun. The force that causes a ball you throw in the air to come down again. The force that causes a car to coast downhill even when you aren't stepping on the gas. The force that causes a glass you drop to fall to the floor.
You can differentiate them as vertebrates.
Bats are mammals
Doves are birds