Which best explains the poor productivity of the open ocean

If you have a difficult time knowing where your hand is without looking at it you may be having a problem with your what ?

Scientists discover two populations of mice on either side of a major river. the two populations have almost identical genes but the mice from one side cannot breed with mice from the other. this is most likely because

Which of the following molecules can be broken down into simple sugars? a. nucleic acid b. protein c. lipid d. carbohydrate