When scientists compare molecular clocks between species, they have to use the same segment of DNA. Which of these statements would explain why that is necessary?

What does the hardy-weinberg principle relate to? a. chances of survival of an organism b. frequency of alleles in a population c. natural selection in a species d. causes of evolution among organisms

Which of the following types of rock would most likely contain a fossil? slate granite lava rock limestone

Which of the following describes a difference when gram-positive bacteria are compared to gram-negative bacteria?