30 points Which of the following statements about change in ecosystems is true?
a. Ecosystems experience change through human activity only.
b. Ecosystems experience change through natural events only.
C. Ecosystems experience no change.
d. Ecosystems experience change through human activity and natural events.
Please select the best answer from the choices provided

What can be added to the examples section of each circle? endothermic: ice melting into water, and a heat pack becoming warm exothermic: a glow stick glowing, and fireworks exploding endothermic: ice melting into water, and an instant ice pack turning cold exothermic: fireworks exploding, and gasoline burning endothermic: a glow stick glowing, and a heat pack becoming warm exothermic: an instant ice pack turning cold, and ice melting into water endothermic: gasoline burning, and an instant ice pack turning cold exothermic: ice melting into water, and an instant ice pack turning cold

Several kinds of bears are found on earth. most bears are brown or black, but one type of bear, the polar bear, is white. what process led to this difference in fur color? explain your answer.

Chlorophyll a had the molecular formula c55h72mgn4o5 how many atoms are in this molecule