Question: Choose your answer.

All living organisms are dependent on plants because plants

OPTIONS:
- produce carbon dioxide
- remove oxygen from the air
- are producers
- are consumers
My Answer: are producers

Question: Choose your answer.

Light rays are focused by the lens of a camera through the process of

OPTIONS:
- reflection.
- refraction.
- dispersion.
- diffraction.
My Answer: refraction.

Question: Choose your answer.

A student pushes a wooden block across a sheet of sandpaper. Which characteristic of the block increases?

OPTIONS:
- hardness
- mass
- size
- temperature
My Answer: temperature

Question: Choose your answer.

When Javier exercises, his muscle cells need more oxygen. Which would help Javier's muscle cells receive more oxygen?

OPTIONS:
- decreasing his respiration rate
- increasing his perspiration rate
- increasing the rate his heart beats
- decreasing the rate his blood flow
My Answer:
increasing the rate his heart beats