During extended, intense exercise, a person begins to tire and breathe heavily. if this person continues to exercise, his muscles will soon switch from aerobic respiration to anaerobic (alcoholic) respiration anaerobic (lactic acid) respiration to aerobic respiration anaerobic (alcoholic) respiration to aerobic respiration aerobic respiration to anaerobic (lactic acid) respiration

Me 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?