Answer:
What stages of aerobic respiration needs oxygen to happen?
The Krebs cycle and the electron transport system
The answer is B I'm pretty sure of it.
Answer:
Abiotic is basically a non living factor so the answer is
D. Sunlight, temperature , conductivity, dissolved oxygen.
All other options contain one biotic or living factor like algae, star fish and crabs these aren't Abiotic.