Which of the following is an agent of erosion?

pressure
acid rain
heat
gravity

5) these are organisms where the genetic material is not bound by a nucleus. they are usually unicellular.

Match the type of adaptation to the correct example, structural adaptation functional adaptation behavioral adaptation example type of adaptation elephants live in herds to protect their young leaves of a rain forest plant species have a pointed tip that enables rainwater to drain off easily. camels have nostrils that they can close snakes produce venom to kill prey and defend themselves. earthworms coil when touched, as part of a defense mechanism. human skin darkens with increased exposure to sunlight.

What are two reasons for why a species might disappear from the fossil record?