Marco was looking at this picture of two boats sitting differently in the water. He decided to compare the way the two boats sit in the water to the way land is behaving in Greenland.

What would be the result if crossing over did not happen during meiosis in humans? a. there would be less genetic variation in humans. b. parents would be more likely to look like their children. c. the human population could not reproduce. d. children would have more chromosomes.

Which of the following best describes the relationship between glucose and complex molecules such as hormones?

How can an organ, such as the lungs, work for multiple body systems?