Question | Answer |
Any living thing that can carry out its life on its own. | organism |
One-celled organism. | unicellular |
Many-celled organism. | multicellular |
A green chemical in plant cells that allows plants to use the Sun's energy to make food. | chlorophyll |
The smallest unit of living matter. | cell |
A layer around the outside of a cell that controls what materials move into and out of the cell. | cell membrane |
The gel-like liquid inside a cell. | cytoplasm |
The largest, most visible part of a cell, which has its own membrane and is the control center of a cell's activities. | nucleus |
A stiff structure that surrounds the cell membrane in some organisms. | cell wall |
All the members of one species in an area. | population |
All the living things in an ecosystem. | community |
The path that energy and nutrients follow in an ecosystem. | food chain |
The overlapping food chains in an ecosystem. | food web |
A relationship between two kinds of organisms over time. | symbiosis |
All the living and nonliving things in an environment, including their interactions with each other. | ecosystem |
An animal that hunts other animals for food. | predator |
A living thing that is hunted for food. | prey |
A relationship between two kinds of organisms that benefits | mutualism |
A relationship between two kinds of organisms that benefits one without harming the other. | commensalism |
A relationship in which one organism lives in or on another organism and benefits from that relationship while the host organism is harmed by it. | parasitism |
Tiny pores found in leaves and stems that allow the exchange of gases. | stomata |
A group of chemical compunds made from carbon, oxygen, and hydrogen. | carbohydrate |
The process in which energy is released from food (Sugar) inside a cell. | cellular respiration |
A diagram that shows the amount of energy available at each level of an ecosystem. | energy pyramid |
The food-making process in green plants that uses sunlight. | photosynthesis |
The addition of harmful substances to the environment. | pollution |
A species that has died out completely. | extinct species |
A species that is in danger of becoming extinct. | endangered species |
A species that is in danger of becoming endangered. | threatened species |
The beginning of a community where few, if any, living things exist, or where earlier communities were wiped out. | primary succession |
The final stage of sucession in an area, unless a major change happens. | climax community |
The beginning of a new community where an earlier community already exists. | secondary succession |