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In a healthy ecosystem, populations of living things are _____________

interdependent

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In a food chain ____ % of energy is passed on to the next higher level.

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There may be __________ between organisms, because most ecosystems don't have unlimited resources.

competition

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A relationship in which organisms both benefit from each other (like a cleaner fish and shark)

mutualism

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An inherited trait is called an ______________.

instinct

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Producers in a community _________________.

make food

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What are some examples of natural causes of population decline?

drought, floods, and hurricanes

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____________ is the cause of most population decline in organisms today.

Human activity

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A single organism in an environment is called an_________.

individual

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Organisms of the same kind living in the same environment make up a _____________.

population

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In a food chain, each level of consumer eats the organism _______________

in the level below it.

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Populations of organisms living together in an environment make up a _____________.

community

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Living organisms and their physical environment make up an ________________.

ecosystem

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A habitat is ____________________________.

a certain part of the ecosystem in which an organism lives

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In an ecosystem, each population as a certain role, or ____________.

Niche

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All life in an ecosystem depends on _____________, to capture the energy of the sun, change it into living tissue, and pass it on to other organisms.

producers

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Consumers must _________________ to get the energy they need.

eat

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A ____________ shows how consumers in an ecosystem are connected based on what they eat.

food chain

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______________ break down tissues of dead organisms.

Decomposers

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What is a food web?

It shows the relationship between many food chains within a single ecosystem.

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What shows the amount of energy available to pass from one level of a food chain to the next?

A food web
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A long relationship between different organisms that live together for most of their lives is called ____________.

symbiosis.

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A behavior that is developed over time is called a ______________.

learned behavior

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A population of organisms that is beginning to decline is considered ____________.

threatened

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A population of organisms that is likely to die or become extinct unless steps are taken to save it is considered _________________.

endangered

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