C. because stimuli is how your body responds to something, and in this case, someone's heart rate increases WHEN their blood oxygen drop. Do you see how it responds? ;-)
Answer:
Amino acid
Explanation:
The basic building block of a protein is called an amino acid. There are 20 amino acids in the proteins you eat and in the proteins within your body, and they link together to form large protein molecules.
Cell theory is the historic scientific theory, now universally accepted, that living organisms are made up of cells, that they are the basic structural/organizational unit of all organisms, and that all cells come from pre-existing cells.
(Hope this helps!!)
Answer:
○ D. Humans are using up natural capital faster than it is being replenished.
Explanation:
I assume this is the answer, due to the past/recent media on Earth and the economy.