Hey, how would I get the half-life and age of the rock in the senecio? Uranium 235 decays into Lead 207. The half-life is 704 million years. If the amount of Uranium 235 is equal to the amount of Lead 207

Which organelle breaks down sugar molecules that supply energy to the cell ?

Give an example of a trait that is controlled by more than one gene.

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?