What is the main difference between the flow of energy and nutrients in an ecosystem? a) nutrients do not flow through an ecosystem, while energy does. b) energy does not flow through an ecosystem, while nutrients do. c) energy cycles through an ecosystem, while nutrients do not. d) nutrients cycle through an ecosystem, while energy does not.

Match each organ or function with its body system. produces urine large intestine ureters mouth filters blood absorbs nutrients from food

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?

The part of the eye that closes and opens to let light in is .