2.
A group of the same species living in one area
3.
Different populations living and interacting in one area
4.
Living and nonliving things interacting in an area
5.
Living or once-living parts of an ecosystem
6.
Nonliving parts of an ecosystem
7.
When organisms fight for the same resources
8.
Anything organisms need to survive
9.
A biotic factor that provides energy for organisms
10.
An abiotic factor essential for survival
11.
An abiotic factor needed for photosynthesis
12.
The top layer of Earth where plants grow
13.
How hot or cold an environment is
14.
Substances in soil that help plants grow
15.
The area organisms need to live and grow
16.
A factor that restricts population size
17.
The ability of an organism to stay alive
18.
Increase in size or number of organisms
19.
When organisms rely on factors to live
20.
Organisms that make their own food using sunlight
21.
Organisms that must eat other organisms for energy
22.
An animal that hunts other animals
23.
An animal that is hunted by a predator
