the correct answer you are looking for would be letter B. formation of geological layers
hope this helps :)
Answer:
In the bloodstream
Explanation:
The metabolic breakdown of amino acids creates ammonia, which is especially toxic to the brain. The liver converts ammonia to urea, and it is then released into the bloodstream, where it travels to the kidneys and is excreted in the urine.
Cell membranes are not solid structures.
A Fragment of strand of nucleic acids isolated from silk moth species containes the base sequence CAGACT. these strands form DNA.