1. What property of the cell membrane allows some molecules to pass easily through, but not all? 2. Because the cell membrane is made of 2 layers of lipids it is called a
3. What is the transport of water across the cell membrane called?
4. Transport that moves materials against the concentration gradient is said to be

Which of these statements best describes the st. lawrence seaway? the st. lawrence seaway connects the st. lawrence river with the arctic ocean. the st. lawrence seaway provides an important trading route between the u.s. and mexico. the st. lawrence seaway provides an important trading route for the u.s, but has little value for canada. the st. lawrence seaway connects the great lakes, the st. lawrence river, and the atlantic ocean.

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.

Explain how mendel kept his pea plant from self pollination