The answer is C because salt water is hypertonic as compared to the solution inside the Amoeba cell. When it is placed in salt water it will lose water by exosmosis and will shrink.
Sand should be your answer because it contains 5,0 premeability variation
Answer: B ventral
Explanation: because ventral is the underside of a plant person animal etc.
The answer is Barchanoid Dunes.
Best of luck,
The Artemis Wolf