In your own words, is the blood an organ ?

Explanation:

Blood is a combination of tissue and fluid,tissues are combination of cells coming together to perform a function.. And blood is made up of red blood cells, white blood cells, plasma,and platelets.. So blood is a tissue

what statement best describes the difference between the sympathetic and parasympathetic nervous systems?

the sympathetic nervous system prepares the body for intense physical activity and is often referred to as the fight-or-flight response. the parasympathetic nervous system has almost the exact opposite effect and relaxes the body and inhibits or slows many high energy functions.