What size molecules can pass through a cell membrane by a process called passive transport?

The rate at which molecules water and oxygen can enter a cell is determined by the-

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.

Which of these parts of the membrane large moecules pass through it ?