Jay, kip, and tia are each measuring the concentration of a solution. they are doing experiments separately. they are all are using a colorimeter—a device used for measuring colors. jay repeats the experiment five times and takes the average measurement, while kip performs the experiment once. tia repeats the experiment three times but chooses one of the measurements instead of the average. the measurements taken by are least likely to contain random errors. nextreset

Look at the photo of the leaf. which term best describes this leaf?

How would you describe the the organisms in the second row of model 1 that are connected to the parents by a line

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.