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Lessons 5.1 and 5.2
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Only about _________ percent of the energy at one level of a food web is available to the next higher level.
10
Producers have the most available energy so they make up the ________________ of the pyramid.
first level or base
What is an energy pyramid?
Energy pyramid shows the amount of energy that moves from one feeding level to another in a food web.
What is a food web?
A food web consists of many overlapping food chains in an ecosystem.
What is a food chain?
A food chain is a series of events in which one organism eats another and obtains energy and nutrients
What are examples of decomposers?
Mushrooms, bacteria, and mold
What do decomposers recycle?
carbon and nitrogen
What is a decomposer?
ecomposers break down biotic wastes and dead organisms, returning the raw materials, such as carbon and nitrogen, to the ecosystem
What are the three kinds of consumers?
carnivores, herbivores, omnivores
What is a consumer?
obtains energy by feeding on other organisms
An organism that can make its own food is a
producer
Which organisms can use photosynthesis to convert energy from the sunlight to food?
plants and some bacteria
Energy enters most ecosystems as
sunlight
In an ecosystem, organisms play the energy role of either
a producer, consumer, or decomposer
Limiting factors include:
food and water, climate and weather, space and shelter.
An environmental factor that causes a population to stop growing or to decrease in size is a
limiting factor
What does emigration mean?
Emigration means leaving a population.
What can cause a population's size to increase?
more births than deaths; more immigration than emigration.
The community of organisms that lives in a particular area, along with the nonliving environment, make up an
ecosystems
What is a community?
All the different populations that live together in an area make up a community
All the members of one species living in a particular area are referred to as a
population
What is a species?
A species is a group of organisms that can mate with each other and produce offspring that can also mate and reproduce.
What is the levels of organization in an ecosystem?
Organisms- Populations- Communities- Ecosystem
What is abiotic factors?
nonliving parts of an organism’s habitat
What is biotic factors?
parts of a habitat that are or were once alive and that interact with an organism
An environment that provides the things a specific organism needs to live, grow, and reproduce is called a
habitat
The food, water, shelter, and other things from its environment is called
resources
What is an organism?
a living thing
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