I only know what question 5 is which is D. Sorry:(
An animal that is only a secondary consumer can also be called a HERBIVORE
The identity of an element can be determined by its atomic number, which tells us the number of protons in it.
The correct answer should be "atomic number", but it doesn't seem to fit in your sentence. Do you mean "element's" instead of "atom's"?
Hydrogen and oxygen are often found in the form of H2O but even if hydrogen surpasses oxygène in number it doesn't when it comes to mass because M(O) = approximately x16 M(H)
