PLZ HELP ME ASAP What is the relationship between reproduction and death rate?

Put in ANY answer that answers the given question, thx.

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What is the compliment dna strand to the following sequence: ttgactaggcta

Which statement best describes the role of religion and culture in ancient medicine?

Which of the following statements is true about the relationship between genetic variation and natural selection? a. genetic variation must be present in a population before natural selection can act on it. b. genetic variation arises in a population as a result of natural selection. c. natural selection can act on a population whether there is genetic variation within the population or not. d. after natural selection acts on a population, the amount of genetic variation in the population always increases.