Which statement is true for bacteria?

a. bacteria break down some foods.

b. all bacteria cause diseases in animals.

c. all bacteria are spiral in shape.

d. bacteria have complex internal structures

answer by yourhope:

answer is

human impact on the environment can be seen in the deterioration of the !

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the rocks are classified by the geological process they are formed by. the three main groups of rocks are igneous, metamorphic, and sedimentary. minerals are not they are classified under the chemical classes they are in. these groups include silicates, sulfates and carbonates.