Which of the following is true regarding active transport

It occurs against Concentration gradient

Explanation:

Transport of molecules from lower concentration to higher concentration to maintain a steep gradient.

lysosome is this part of the cell is surrounded by a very thick outer membrane to protect the rest of the cell from its strong enzymes.

the most common type of reef is the fringing reef. this type of reef grows seaward directly from the shore. they form borders along the shoreline and surrounding islands.