Which of these limiting factors could cause tree squirrels to lose their homes?
a. a natural disaster
b. an increase in predators
c. an animal disease
d. an increase in competition for food

Explain why components that are naturally found in air can be considered air pollutants.

Is water wet? and is fire on fire?

The diagram shows the positions of the sun, moon and earth during spring tides, when the high tides are at their highest and low tides at their lowest. what is it about these positions that causes these high and low tides?