Which statement is true about the elements of the earth?
a.
earth's elements are used and reused in different molecules over time.
b.
earth's elements stay in the same areas of the lithosphere, hydrosphere, or atmosphere where they originated when the earth was formed.
c.
earth's elements pollute the environment and should be discarded.
d.
earth's elements are constantly being created and destroyed so that a constant amount of matter exists.

A.  

Earth's elements are used and reused in different molecules over time.

Explanation:

Earth elements remain constant and are used and reused in different molecules over time.

A good example is water, it is used and poured to the ground.

After this it rises through evaporation to form clouds and later come down as rain.

Rain water is collected and used for different purposes including industries, agriculture and for domestic use.

A.) raccoons, fish, and ducks are secondary consumers

Explanation:

B.) is incorrect because the aquatic crustaceans in this food web are herbivores

C.) is incorrect because the algae and floating plants are producers

D.) is incorrect because only the minnows are primary consumers and not the fish

i hope this helps! :)