An ecosystem is where the biotic and abiotic factors live. The other options only contain biotic factors.
Answer from: Quest
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.
Everything in the universe originated from a single point. how was it possible for everything in the universe to have occupied a single point in space?