If you put a protist into the same three environments, which environment would you expect its contractile vacuole to be most active

The completed part include the three environment, Hypertonic, isotonic and hypotonic.

The contractile vacuole will be most active in hypotonic environment.

Explanation:

The protist's contractile vacuole will be most active in hypotonic environment because it has lower concentration of solutes outside the cell than other solution which have salt particles which will allow water to constantly entering the cell through osmosis but the protist will counter this by it's contractile vacuole which let out water . The protist contractile vacuole will not hypertonic environment because it will cause the cell to shrink and lose water.

enzyme speed up the reactions

yes it is   dangerous

explanation:

because that foot is discusting and could get you sick