What must occur in order for two populations to be considered the same species? (A) The Two Populations Must Be Able To Produce
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(B) The Two Populations Must Descend From The Same Ancestors
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(C) Their DNA Must Be An Exact Copy Of Another's

answer; ///(b) it is composed of four protein chains and four heme groups;

the index of refraction of the second medium is higher. i just took the test trust me !

im not intirely sure but i think the anwser is d relative humidity

answer >   yes we do, women; have three holes, urethral opening(pee hole, vagina, and the women pee/girls pee out of the urethra like the men do; only they have a single opening to pee/ejaculate.   (sorry if i'm too forward with this, but this is for a biology class, isn't it? )

hope that !         : )