In the same science fair, tina asks the question “does caffeine increase the heart rate of an earthworm? ”
in test 1, she measures the heart rate by looking at the earthworm under a microscopes, the earthworm
has a heart rate of 50 bpm (beats per minute). in test 2, she places a few drops of caffeine on the
earthworm’s skin and measures the rate again. in this test, the heart rate is 68 bpm.

Which must be kept in mind when determining if an explanation is correct? check all that apply.which must be kept in mind when determining if an explanation is correct? check all that apply.

Sarah and john are having a discussion on genetic diversity. sarah believes that it happen over a long period of time. john it happens immediately. who is correct? a. sarah is correct because genetic diversity occurs over a long period of time. b. john is correct because genetic diversity occurs immediately. c. both are correct because genetic variation can occur or long period of time. d. neither are correct because genetic diversity occurs over any period of time

Describe your dna model. which part do the straws represent? the pushpins? the paper clips and the black dots you made with the marker?