Species change over time. -The mechanism that produces the change is natural selection: the differential survival and reproduction of individuals based on variation in their traits. Natural selection acts on individuals but individuals do not evolve; their descendants do.
1) d. mitochondria
These are found in both plant and animal cells.
2) b. fluid
For example factories in America will give off a lot of pollution but then thanks to the wind it will effect other places like Europe.
