What human acting promotes the ability to find this species of plant and discover its potential use for medicines?

My question says on my assignment. read the following scenarios and decide which of the properties of life are being described. the first one is. katherine stopped on the way to school to grab some donuts. 2. because a dog cannot sweat, it has to pant in order to stay cool. 3. an elephant trun had no bone but 4,000 muscles. i have no idea what i am supposed to anwer. i can't find the answer in my notes or book that i can understand anyway

What's the waste product of electrons and pyruvate combining in fermentation?  

_tissues respond quickly to outside stimuli a) epithelia b)nervous c)muscular d)muscular and nervous