All living organisms are dependent on plants because plants OPTIONS:
- produce carbon dioxide
- remove oxygen from the air
- are producers
- are consumers
A: are producers

Which property of air does a barometer measure? OPTIONS:
- speed
- pressure
- humidity
- temperature
A: pressure

Grooves running down the sides of a riverbank are most likely caused by OPTIONS:
- wind.
- rocks.
- leaves.
- rainwater.
A: rainwater.

A newborn kangaroo has the ability to crawl into its mother's pouch to drink milk. This is an example of OPTIONS:
- migration.
- an instinct.
- hibernation.
- a learned behavior.
A:
an instinct.