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Science Unit 1.5-1.8
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Anything humans add to the environment that hurts living things is called
pollution
Since humans can eat food from many ecosystems, they are ____?
part of many food webs.
Living things obtain matter from their environment and release___ back into the environment?
waste
Does an eagle hold more or less energy than a field mouse?
A lot less energy
A model that shows the amount of energy that is passed at each level is____?
An Energy Pyramid
A field mouse that eats grass is call a ____?
first level consumer
What happens to gases in an ecosystem?
They are recycled.
What happens to matter in an ecosystem?
It cycles between parts of the ecosystem.
How are food webs related to food chains?
Food webs are overlapping food chains.
What do all food chains have in common?
They all begin with a producer.
Why is the base of the energy pyramid larger than the top?
Energy is lost as heat at each level, so less energy is available at the top.
If the number of predators is decreased, what happens to the population of prey animals?
The number of prey can increase too much
If there are not enough prey, what happens to the predators?
They may starve
In order for an ecosystem to be healthy, what must exist between predators and prey?
Balance
What kind of ecosystem allows many species of organisms to meet their needs?
A healthy ecosystem
An animal that is captured and eaten
Prey
An animal that captures and eats other animals
Predator
If animals cannot adapt to their changing ecosystem, what may happen to them?
They may not survive.
Why do animals hibernate?
Because they cannot find food in the colder weather.
Why do animals migrate?
To meet their needs.
Two ways humans change ecosystems are:
1. Deforestation (cutting down trees) 2. Building Dams
Three natural changes to an ecosystem are:
Hurricane, Floods Drought (also fire, landslides, tsunami)
Slow changes that take place in an ecosystem after a disturbance.
Succession
An event that changes an ecosystem for a long period of time.
Disturbance
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