Which statement best describes an ecosystem
maintaining a state of approximate equilibrium?
(1) nutrients from decayed organisms are
recycled in a forest ecosystem.
(2) all the frog species in a south american rain
forest become extinct.
(3) a mutation spreads through a species of
bacterium, making them unable to decompose
wastes.
(4) mice are released into a field ecosystem as
food for a declining predator population.

Me 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?