Which best describes oogenesis?
a. oogenesis involves mitosis but not meiosis.
b. oogenesis differentiates oogonia directly into eggs.
c. oogenesis starts in development and then is halted until puberty.
d. oogenesis happens in the testes.

When plants use sunlight to make food, the energy of sunlight is

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?

Crossing over is a method of (blank)?