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.

the bald eagle got 50 because everything gets 10% of what they consume and since 50 is ten % of 500 hundred that means the   grasshopper had to have consumed a plant with 5,000 calories of energy

he movement of air through earth's or any planet's atmosphere is called wind, and the main cause of earth's winds is uneven heating by the sun. this uneven heating causes changes of atmospheric pressure, and winds blow from regions with high pressure to those with low pressure.

i hope this : )