Which of the following statements is true?
A. Biodiversity provides additional resources that raise the carrying capacity of an ecosystem.
B. Biodiversity increases an ecosystem's ability to withstand changes.
C. Biodiversity makes an ecosystem more difficult to destroy.
D. Biodiversity provides additional sources of food for the weakest organisms in an ecosystem.

Aballoon is rising vertically upwards at a velocity of 10m/s. when it is at a height of 45m from the ground, a parachute bails out from it. after 3s he opens his parachute and decelerates ata a constant rate 5m/s. when. (a) what was the height of the parachutist above the ground when he opened his parachute? (b)how far is the parachutist from the balloon at t=3s? (c)with what velocity does the parachutist hit the ground? (d)after how long does the parachutist hit the ground after his exist from the balloon?

The ability to make things happen is also called a. heat b. force c. matter d. energy

Aphase diagram assumes is kept constant.