Asap why is it important important to know about watersheds? explain well pls

Are substances released into the environment that in excess amounts cause damage

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 is a macronutrient? carbohydrates lipids amino acids all of the above