Need help on question 3 !!

Which class of organic compounds makes up the channels and pumps that move materials from one side of the cell membrane to the other? a.) carbohydrates b.) lipids c.) proteins d.) nucleic acids

In the water cycle , when does water undergo a chemical change

Which of the following situations describes a adaptation for a mole? question 2 options: a mole is blind and cannot see underground. a mole is bright and attracts the attention of predator birds. a mole has a sensitive sense of smell to it find food underground.