Which must be true for two organisms to be considered the same species a. they are attached to each other b. they have the same genome c. they can produce fertile offspring d. they have all the same traits

➷ It would be C. They can produce fertile offspring

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C. They can produce fertile offspring

Explanation:

The organisms said to be belonging to the same species are expected to interbreed among themselves and should be capable enough to produce live  fertile offsprings. The members of the same species may also exhibit similarities in morphology, anatomy and genetic level.

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

they deliver oxygen to the blood