Which of these would best describe why cells had to evolve to contain a nucleus before more complex, multicellular organisms could develop? a) without a nucleus, early cells did not have the ability to reproduce b) a nucleus allowed organisms to make necessary proteins and regulate homeostasis c) a nucleus had to evolve to hold the dna as simpler organisms did not contain dna d) the nucleus contained the genetic material is one location which made it more efficient to control cellular functions

20 point pls brianliest 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?