Answer:
The correct answer is A
Explanation:
Eukaryotic cells have a nucleus containing their DNA, whereas prokaryotic cells do not have a nucleus.
Answer:
Low - The generation of nitrates (NO 3-) requires oxygen, so the oxygen levels will be low
Explanation:
Nitrates are formed when the ammonia react with oxygen present in water. The oxygen which react with ammonia is not the oxygen of water molecule, it is the dissolved oxygen. This oxygen is used by aquatic animals for breathing. If nitrates are formed so the concentration of dissolved oxygen will be lowered which causes suffocation and bad impact on marine organisms and the whole ecosystem will be disturbed.
The molecular clock is a figurative term for a technique that uses the mutation rate of biomolecules to deduce the time in prehistory when two or more life forms diverged. The biomolecular data used for such calculations are usually nucleotide sequences for DNA or amino acid sequences for proteins.
Explanation:
I think its the c. archaebacteria because there are hundreds of species of archaebacteria living under the sea.....
and bacteria is harmful to all lifes of species..
Each time an organism is consumed, 90% of the energy is lost as heat. that leaves only 10% for the carnivore
