What is the major difference between primary and secondary succession? Group of answer choices

Primary succession always occurs before secondary succession.

Secondary succession starts with pioneer species like mosses and lichens.

Primary succession takes place after mature communities are established.

Secondary succession happens in an area that already has soil and organisms.

Someone me with this: a mineral' is determined by its actomic structure.

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?

Si units are the modern form of the