Answer:
I think the answer is A sexual reproduction results in more time to produce organisms than asexual reproduction.
I believe the bone system that red marrow belongs to is D. Skeletal system.
Answer:
carbon dioxide, NADH, FADH2
The Krebs cycle sends NADH and FADH2 to the electron transport chain after producing it, that means it inadvertadly makes CO2
In order to "invest" in later stages to get more energy per glucose molecule. It could also be because that is how it is done, it wouldn't be as efficient unless these stages were performed.
hope this helps!