when things happen you usually ____ to it
react
to act together (dancing, speaking...)
interact
things that you can use
resources
a large, natural stream of water
river
how much there is of something
amount/supply
when things are in _____, they are even
balance
a group of animals and plants, the place they live in, and how they act together
ecosystem
something that is bad
negative
the amount you have of something
supply/amount
how high or low something is
level
something that is good for you
positive
means to grow in size or in number
increase
a contest or struggle between two or more people or animals
competition
to make a person or thing do what you want
control
You say the o in positive the same way you say the a in
wash
cake
nature
hat
to become smaller in number, amount or size
decrease
what a person or animal does
behavior
things like rivers, trees, and animals
nature
when something is ____ it is hard to find or get
scarce
a series of animals and plants in which each one feeds on the one below it
food chain
a long time of dry weather
drought