Which of the following represents an ion

Which medullary index indicates a human hair? a. 0.653 b. 0.733 c. 0.516 d. 0.256

According to the big bang theory, after the "bang," the universe remained dark until about  300,000 yearsone billion yearsthree minutesthree billion years  later, when neutral atoms began to form.

What best explains the inability for life to exist in earth early atmosphere