Which statement describes a situation that leads to stability within an ecosystem?
Carbon dioxide and water are released only by abiotic sources in the ecosystem.
Interactions between biotic and abiotic components regulate carbon dioxide and water levels.
Animals provide the oxygen used by plants, and plants provide the nitrogen needed by animals.
Organisms provide all the necessary energy for the maintenance of this ecosystem.

80 points pls brainliest 1. what does a red shift mean? blue shift? 2. describe the big bang theory. according to this theory, how old is the universe? 3. scientists believe the universe is expanding. what is the evidence that supports this? 4. describe a nebula. 5. describe the 3 types of galaxies. what is a barred spiral galaxy? 6. what is a light year? how far is alpha centauri from earth? 7. describe the universal law of gravitation. be sure to include gravitational force between two objects. 8. describe the planets’ orbits around the sun. 9. what is the asteroid belt? where is it located? 10. describe rotation and revolution of earth. what determines an earth day and year? 11. how do galaxies exist? 12. compare and contrast the inner and outer planets. 13. what causes the seasons?