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The answer you were looking for is....
(D) Nonpoint source pollution is difficult to regulate, because its source is difficult to track.
The man responsible for developing the modern scientific classification system, that scientists still use and follow today is Carolus Linnaeus.
The correct answer for the question that is being presented above is this one: "<span>the mammal and the reptile." </span>The additional piece of information will be most helpful to Julia to properly build her phylogenetic tree is that i<span>t is trying to figure out on what tree it belongs to but it has some features of the animals but the 2 main ones: the mammal and the reptile.</span>
Answer:
A. Books and DVDs can be given new life as well.
