You're heating a chemical in a test tube over a
bunsen burner. which of the following actions
should you take to be safe? check all of the boxes
that apply.
point the test tube away from you.
touch the test tube to see if it's hot enough.
lean over the test tube to see if it's boiling.
keep the sleeves of your lab coat away from
the flame.

keep the sleeves away from the flame

Explanation:

it is safe

Point the test tube away from you and Keep the sleeves of lab coat away from the flame

hormones in blood stream

image: dtc.ucsf.edu

endocrine glands secrete hormones into the blood stream near them; the hormones then travel in our bloodstream until it reaches its destination, called a target cell, in distance parts of the body. in the target tissue, hormones lock onto the target’s plasma membrane, called the receptor site.

sheep is a herbivore animal whereas grasshopper belongs to the class chordates but both of them feed on greens.  

if grasshopper and sheep feeding on a pasture land, i do not think both of them will have any impact on each other. however, the number of the species can make difference. since sheep feed on greens, there is a possibility there left no pasture land for the grasshoppers or they may get extinct.