Suggest a possible hypothesis regarding how the mass of a rock changes when placed in water. identify the independent and dependent variables.
if a rock is placed in water with significant acidic level it will eventually dissolve some of the rock.

what would the independent and dependent variables be?

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)

there are so many examples for that in different areas, like biology experiment carried out in our lab recently.

here's one link: