Answer:
The length of the two wires
Explanation:
A control variable is what you keep the same through the whole experiment so therefore it could be both length and diameter
Answer:
Biome- A group of ecosystems with similar climate, vegetation, and wildlife
Ecosystem- All living and nonliving things in an area
Organism- A complete living thing
Community- All living things in a particular area
Population- A group of organisms of the same species in an area
I would say oxygen because respiration is breathing mechanically.
Organic molecules can form in a reducing atmosphere. Good luck.
