Question

how would the contractile vacuole of a freshwater amoeba respond if the organism was placed in seawater?
with more contractions
with fewer contractions
the contractions would suddenly cease
with the same frequency of contractions

Explanation:

Fresh - water amoebas have contractile vacuoles to expel excess water due to the hypotonic environment. Seawater is hypertonic compared to the amoeba's cytoplasm. In seawater, there is less of a need to expel water, so the contractile vacuole would contract less frequently.

Answer:

with fewer contractions