Each of the following hormones is an amino acid derivative except
a. epinephrine
b. norepinephrine
c. thyroid hormone
d. thyroid stimulating hormone
e. melatonin.

E. Melatonin.

Explanation:

Melatonin is a kind of hormone which is not the derivative of aminoacids. It regulates and maintains the sleep and wake cycle in the human body. It is secreted by the pineal gland. It is used for the short term treatment for trouble in sleeping, and condition of jet lag. The concentration of release of the melatonin is more in dark and less in light. The production of melatonin decreases with that of age.

answer:

i don't believe the ocean is purple, but it might once have been:

as for the sky, according to nasa:

"sunlight reaches earth's atmosphere and is scattered in all directions by all the gases and particles in the air. blue light is scattered more than the other colors because it travels as shorter, smaller waves. this is why we see a blue sky most of the time."