The movement of ions or molecules across a cell membrane from an area of lower concentration to one of higher concentration. It's a movement that requires energy supplied by ATP.
O Passive transport
O Osmosis
O Facilitated diffusion
O Active transport

What kind of action is a cause of air pollution

Select the correct answer. in the image, if the washcloth represents consumed food, which organ of the digestive system correctly represents the action performed by the hands? hands squeezing water from a washcloth a. esophagus b. large intestine c. liver d. mouth

There are only about 250,000 known fossil species. true or false