Which of the following is true regarding the gradient of a stream?
A.
The steeper the gradient, the greater the stream velocity.
B.
The steeper the gradient, the wider the streambed.
C.
The steeper the gradient, the deeper the streambed.
D.
The steeper the gradient, the lower the stream velocity.

Which of the following describe the role a biochemical pump plays in active transport? a it prevents water from moving across the cell membrane. b it uses energy to move materials across the cell membrane against the concentration gradient. c it large molecules cross the cell membrane without using energy. d it a cell move molecules from an area of higher concentration to an area of lower concentration.