Why can the reduction in melting temperature for hybrid dna between two mammalian species be used to predict how long it has been since those species diverged from a common ancestor? a., mutations in dna accumulate at a fairly constant rate. b., closer relatives have fewer dna base pair mismatches. c., closer relatives are less likely to be reproductively isolated.

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Scientists are conducting a study on the effectiveness of a new drug on memory loss. they are giving some of the test subjects the new drug to find out if it improves their long-term memory. which are possible limitations of this study? check all that apply. a) test subjects may want to participate in additional experiments. b) test subjects may think they should be paid more. c) test subjects may get bored and want to quit early. d) test subjects may have to travel during the experiment. e) test subjects may have full-time jobs. this is multiple choice. you for the !

Which to produce involved from a symbiotic relationship of organisms which resulted in eukaryotic organisms contain chloroplast