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
The answer is The Nervous System.
It interacts with all the other systems, it tells them what to do.
Hope it helps!
Relative dating best helps determine fossil age. It's where layers of sedimentary rock and fossils pile up on top of each other; the oldest fossils being in the bottom layer and the youngest in the top.