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100

The _____ of something is how much of it there is.

amount

100

When things are in _______, they are even.

balance

100

  To ________means to grow in size,
  number or in amount.

increase

100

  To ________ means to communicate or
  react to one another.

interact

100

  To _______means to make a person or
   thing do what you want.

control

200

  When things happen, you usually
  _____ to them.

react

200

________ is what a person or animal does.  

Behavior

200

  When something is ______, it is hard to
  find or get.

scarce
200

  When you _________ something, it
  becomes smaller in number, amount, or in size.

decrease

200

It is a large, natural stream of water

river

300

How high or low something is

level

300

When the weather is dry for a long time

drought

300

  A ______ is the amount you have of
  something.

supply

300

A group of animals and plants, their place, and how they act together.

ecosystem

300

A series of animals and plants
that need each other to survive.

Food Chain

400

Something that is _______ is bad for you.

negative

400

This makes something happen.

Cause

400

Explain deforestation.

When trees are cut down and not replaced, animals lose their homes, and the air becomes less clean.

400

It is what happens after.

effect

400

Something that is _______ is good for you.

Positive

500

A contest or struggle between two or more people or animals.

Competition

500

Are things available you can use.

resources

500

Give one (1) way nature can lose its balance and explain it in 1 sentence.

Any of the 8 Ways Nature Can Lose Its Balance, and the student's explanation.

500

What is overfarming?

When people farm too much on
pieces of land, the soil can have less nutrition.

500

What is overhunting?

When people hunt too many animals in an area the animals can become endangered or go extinct.