Answer: Photosynthesis
Explanation: Photosynthesis removes CO2 from the atmosphere and replaces it with O2. Respiration takes O2 from the atmosphere and replaces it with CO2.
Answer:
Other species that rely on those fish would die off. The extinction of one species can lead to the extinction of another and so on.
Bacteria, archaea, fungi, algae
Molecular clocks B. TAKE ADVANTAGE OF THE FACT THAT ALL MUTATIONS HAPPEN AT A STEADY RATE.
The molecular clock is a technique used involving the mutation rate of biomolecules to deduce when in prehistoric times have two or more lifeforms diverged.
N2(g) + 3H2(g) <--> 2NH3(g)
Bear in mind that this is a reversible reaction.