Wait this is highschool biology?!
Woah... thought it would be harder....
Anyways, see "micro" means really small, so small that your bare eyesight can't take it (or see it, I don't care). A microscope was meant to see things that our eyes can't. Since humans cant see microlife we use a microscope.
Mind Blown...
Answer:
Artery
Explanation:
Artery carries blood from the heart to other part of the body. While vein return the denourished blood to the heart via the ivc
Producers. They’re usually producers.
Hormones are a group of chemicals released by exocrine glands

These hormones are directly secreted into bloodstream from where they reach the site.