The ocular. Maybe a mirror, depending on the model.
Concretions im pretty sure because they are in a <span>spherical shape</span>
Answer:
Silk is a highly economic fiber, with a unit of raw silk worth about twenty times the value of raw cotton. Aside from silk, these insects are used to feed pets, apparently the healthiest natural food source. ... The above economic and health benefits, not an exhaustive list, justifies the title of queen of insects.
The correct answer is D, white blood cells.
We know that red blood cells deliver nutrients and are not apart of the immune system; platelets are responsible for coagulation, which has nothing to do with the immune system, and plasma is a substance that, again, has nothing to do with immunity. White blood cells are the only things that fight disease (antibodies are white blood cells)!
I hope I helped!
(By nothing I meant very little to none).
