Urgent what’s the role of oxygen in cellular respiration? it accepts electrons and keeps the electron transport chain running. it breaks down carbon-based sugar molecules to release energy and forms carbon dioxide. it combines with hydrogen ions in sugar molecules to release energy and form water. it supplies electrons to the electron transport chain to keep it running.

What must be true for natural selection to heppen

To determine if a particular plant is homozygous or heterozygous, you would have to test cross with a

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?