Ecosystems

Non-living things in an ecosystem.

• biotic
• abiotic
• producer
• individual

A relationship between two organisms in which one organism benefits and the other is unaffected.

• mutualism
• commensalism
• parasitism
• competition

Any necessity of life, such as water, nutrients, light, food, or space.

• parasite
• biotic
• consumer
• resource

A group of similar organisms that can breed and produce fertile offspring.

• individual
• predator
• species
• consumer

A series of steps in which organisms transfer energy by eating and being eaten.

• food web
• food chain
• energy pyramid
• food pyramid

Which statement best describes the word "decomposer"?

• An organism that decays over time
• An organism that kills living things
• An organism that consumes other organisms to get energy
• An organism that breaks down dead organisms and organic matter

A biological community of interacting organisms and their physical environment.

• Commensalism
• cellular respiration
• ecosystem
• abiotic

Something in the environment that keeps a population from steadily increasing is known as

• a limiting factor
• the carrying capacity
• population density
• reproduction

All living organisms need _________ to survive and grow.

• light
• energy
• ecosystems
• cancer

Producers are special because

• they are green
• they turn oxygen into carbon dioxide
• they can make their own food
• they are at the top of the food chain