D. POPS.
Your answer is D because pesticides have aldrin, chlordane, .... which are all POPS.
Fish and marine mammals sift out the salt from the water, then they drink it.
<span>Answer: C) nearly 0% hydrogen </span>
Hydrogen plays a very significant part in the existence of stars around nebulae. A vast amount of hydrogen is needed for stars to be born. Hydrogen heats up and ignites due to a chain reaction from the collision of atoms but since there is no gravity acting upon the nebulae, it takes millions of years for the stars to exist.
<span><span>We can assume then that when the stars are born they contain 100% hydrogen. As they age, hydrogen is depleted. The oldest the star the least hydrogen it has. So the answer is </span><span>C) nearly 0% hydrogen </span></span>