The c-cells of the thyroid synthesize:
a. t4
b. tsh
c. pth
d. t3
d. calcitonin

D. Calcitonin

Explanation:

C-cells are also called parafollicular cells, these cells are located adjacent to the thyroid follicles. These cells work as antagonist cells of the Vitamine D and the parathyroid hormone. The parafollicular cells are stimulated by high serum levels of calcium. The higher the calcium levels are they start to release the calcitonin.

answer:

a licensed practical nurse (lpn), in much of the united states and canada, is a nurse who cares for people who are sick, injured, convalescent, or disabled. in the united states, lpns work under the direction of physicians.

explanation:

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."