What is the difference between a phase and a phase transition?
a. a phase is a region with homogeneous (uniform) properties and a conversion between states is called a "phase transition"
c. a phase is a physical property and a phase transition is a chemical change.
b. a phase is a chemically distinct state of matter and a phase transition is a chemical change.
d. none of the above?

a. A phase is a region with homogeneous (uniform) properties and a conversion between states is called a "phase transition"

Explanation:

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In this case, we first must consider that a phase is defined in terms of the molecular distribution of a substance, therefore, for a single phase, its properties must be homogeneous to be considered as it. On the flip side, the phase transition is the correct term regarding the "change of state" of a substance, say melting, freezing, deposition, sublimation, condensation and boiling. Consequently, the answer is:

a. A phase is a region with homogeneous (uniform) properties and a conversion between states is called a "phase transition"

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one negative thing it that it can kill water animals. another negative thing is it can cause the destruction of ecosystem. one way water pollution can be reduced is to conserve energy.