Endocrine. Because insulin is a hormone that are produced in the endocrine gland such as pancreatic gland
Answer:
Other species that rely on those fish would die off. The extinction of one species can lead to the extinction of another and so on.
Y=-(x^2-20x+64)
----find two numbers that multiply to 64 and add to -20. They are -16 and -4--
y=-(x-16)(x-4)
ROOTS : 16, 4
All of these are necessary, but what you need the most I would say is
D. Movement
Without movement, your body can stiff up, causing muscle problems which can lead to many various things.