200
If organisms cannot get the _________ they need their populations may only be small.
_________ is when animals move out of an area, usually when recourses become scarce.
Organisms are in ___________ with one another for the resources they need.
A ________ is an animal that catches and eats other animals.
A ________ is an organism that has to eat other organisms to stay alive, for example animals.
A _________ is an animal that only eats other animals.
A _________ is an animal that eats plants only.
A ________ is an organism that is able to make its own food, for example plants.
A _______ of numbers is a way of showing the numbers of different organisms in a food chain.
A _________ is a chemical that kills pests.
___________ is poison used to kill insects.
Organisms contain stored energy called ________ energy.
