Form a Hypothesis: As the map shows, the sickle cell allele is not found in African populations that are native to southern Africa. Form a hypothesis to account for this discrepancy

Nucleic acid certain protein cell membranes certain carbohydrates

Stephen is a student who wants to test his knowledge of medical terminology. which option could he use?

Which statement describes compounds a. compounds are made of one type of atom. b. compounds cannot be represented by models. c. compounds are represented by chemical formulas. d. compounds cannot be broken down into simpler forms.