Answer: C would be the answer i believe.
The nervous system is responsible for the many actions and movement of the body. It is an organ system that sends and receives, even also influences many cellular and organismic phenomenon.
A nerve damage at a specific area for example a nerve damage was incurred for your right hand, since the nerves in that area were destroyed or were paralyzed the dendrites are unable to receive and the terminal buds are unable to send a specific neurotransmitter called the acetycholine for the muscle cells to initiate and process the enzyme which enables the muscle to interact and react.
I have reason to believe that 2 is the answer, because since all individual pathogens are the same, they will all react in the same way to the antibiotic. thus natural selection will exterminate them the fastest.
Hemoglobin is a molecule with a central iron atom responsible for carrying oxygen in your blood cells, as a result, when an oxygen atom bonds to the iron atom, hemoglobin causes the blood to appear bright red (think of it like iron rusting due to exposure to oxygen).
Veins appear blue due to how light reflects off of the various tissues but our blood is NOT blue when it isn't exposed to oxygen.
Arteries have oxygen-rich blood and veins have oxygen-poor blood. Veins carry blood toward the heart and arteries carry blood away from the heart. You can remember this easily because our cells need oxygen and, because arteries carry oxygen-rich blood, they are responsible for carrying blood away from the heart to the different parts of our bodies.
Veins carry the oxygen-depleted blood back toward the heart so it can become oxygen-rich again.
