Physical properties of matter a. can be observed without changing the substance c. are a result of some sort of reaction. b. describe how substances interact with other substances d. can only be determined through experimentation.

A = Can be observed without changing the substance.

Explanation:

Physical Change:                                                                                              

The changes that occur only due to change in shape or form but their chemical or internal composition remain unchanged.

These changes were reversible.

They have same chemical property.

These changes can be observed with naked eye.

Chemical change:

The changes, that occur due to change in the composition of a substance and result in a different compound is known as chemical change.

These changes are irreversible

These changes occur due to chemical reactions

These may not be observed with naked eye

the answer is the first option

explanation:

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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.