Light from stars provides evidence that the universe is expanding. Which two statements explain how light from the stars indicates the universe is expanding?
A. The light waves are closer together than predicted.
B. The light waves get "stretched out" as they travel.
C. The light waves appear redder than expected.
D. The light waves look bluer than they should.

B. The light waves get "stretched out" as they travel.

C. The light waves appear redder than expected.

Explanation:

You might hear about doppler effect before. An ambulance siren will be heard differently when it coming to you and when it moves away. When moving away, the frequency of the sound will seem to keep getting lower to the observer. A lower frequency means the sound appear to have a longer wavelength.

When scientist examines the lightwave from the distant stars, they find that the light wavelength seems stretched out and then it should be. The light also seems redder than expected. Redder light means the wavelength is longer, so the object should move away from our observation point.

1. a host loses nutrients to a parasite

2. a parasite only benefits when the host is alive (cause if the host dies the parasite dies with it )

3. producers to consumers

4. the tapeworm is a parasite

5. they convert energy from the sun (photosynthesis)

6. sunflower-robin (i think im 80% sure)

7. producer

8. consumer

9. prey

10. fresh water snails ( cause the green algea is the producer and the snails are the primary consumers and the small fish consumer so is the big fish)