LS 2: The Ecosystem in Retrospect

____________ is the relationship between two different kinds of organisms that live close to each other.

• symbiosis

• decomposers

• predation

• consumers

The ultimate task of breaking down the remains of organisms are performed by ________________.

• food web

• predation

• decomposers

• nitrogen cycle

A symbiotic relationship in which one organism kills another for food is called _________.

• photosynthesis

• consumers

• decomposers

• predation

The ___________ shows how food is produced and transferred from producers to consumers.

• trophic structure

• food chain

• predator

• prey

Energy flow in food chains and food webs is represented by an ___________________.

• Ecological pyramid

• Nitrogen cycle

• Phosphorus cycle

• Biogeochemical cycles

Nitogen-fixing bacteria are important to the __________________.

• Phosphorus cycle

• Nitrogen cycle

• Biochemical cycle

• Water cycle

Animals are the ____________________ in a food chain.

• decomposers

• consumers

• predators

• producers

__________ refers to the food-making process in plants.

• food chain

• food wed

• predation

• photosynthesis

Multiple food chains linked together make up a _____________.

• ecological pyramid

• food web

• photosynthesis

• predation

The nutrient cycles are ___________________ cycles.

• carbon dioxide-oxygen

• biogeochemical

• nitrogen

• phosphorus