<span> (3) contain structures that perform life functions</span>. Although unicellular organisms have less capacity to survive than multicellular organisms, they contain internal structures or organelles that perform different functions to maintain stability and survival.
Hormones are a group of chemicals released by exocrine glands

These hormones are directly secreted into bloodstream from where they reach the site.
Urochordata is another invertebrate other than hagfish.
12/44 = 0.2727
(X100)
= 27
( therefore the percent mass of carbon in carbon dioxide is 27%)
im not to sure, but i think its 21.95
hope this helps! :)