Some protozoans have special organelles called contractile vacuoles that continually eliminate excess water from the cell. The presence of these organelles tells you that the environment is to the protozoan

Hypotonic.

Explanation:

Hypotonic is a description of the solute content of one solution in relation to another solution. It is used in biology to help scientist describe cells. Knowing the osmolarity (concentration of a solution in number of solutes per liter) of different solutions can show scientists which way the water gradient and solute gradients will form.

oak trees? ? what was listed

the missing space is phylum