Which would be least helpful in reducing indoor pollution?

Which of the following is not considered an appendage of the skin? nails glands follicles none of the above

Which of the following was not a major animal on land during the carboniferous period? amphibians insects both a and b none of the above

According to theories of how life began, how did early organic molecules begin to separate from the outside world? a: specialized enzymes were required b: chains of amino acids created a barrier c: formation of microspheres or vesicles d: rna catalyzed the formation of membranes