1
Ecosystems are healthy when all their parts are
Balanced
Two different organisms can live closely together, this relationship may be____
helpful to both organisms and/or helpful to one but not the other organism (parasite and host)
An organism that feeds on and harms a living thing is called _______.
parasite
The process of one community gradually replacing another community is _______.
succession
Balanced ecosystems are _______ changing.
always
Populations _____ when their need are met.
grow
Changes in the environment can happen _____
over thousands of years and/or in a very short amount of time (fires, natural disasters).
What do you call a species that has no living members?
extinct
What do you call an organism that provides energy or an environment for another organism?
host
When people litter, they ____ _____ protecting the environment.
are not
When two or more species must use the same limited resources, ________ occurs
competition
Who or what affects the environment negatively the most?
humans
What do you call the struggle between organisms to meet their needs?
competition
All plants and animals need six things to grow and be healthy. Name them.
Food, water, shelter, living space, air, and sunlight
Certain behaviors ______ animals avoid or reduce competition.
help
Adding harmful material to the environment is called
pollution
What occurs as the environment changes?
succession
A species that is at risk of dying out is called a(n) ________ species.
endangered
Carpooling __________ air pollution.
decreases
Explain the relationship between parasites and hosts
. . . . . . . . . . . . .
What is a way that people can help protect the environment?
Take part in car pools.
What do plants and animals need to grow?
place to live and/or right weather and/or space
What can be very harmful to organisms and the environment?
hazardous waste
______ organisms help keep the balance of an ecosystem.
All
How could a flood affect an entire ecosystem?
. . . . . . . . .