The correct answer is A
I am sure it is Oxygen
Hope this help
Answer:
They are parasitic.
They are not a roundworm.
Leeches lack setae.
Yes they do have medical uses.
Yes leeches are segmented.
Sorry if I am wrong
Answer;
The above statement is true
Norepinephrine and epinephrine receptors are separated into the categories of alpha and beta.
Explanation;
-The adrenergic receptors are a class of G protein-coupled receptors that are targets of many catecholamines like norepinephrine and epinephrine produced by the body.The types adrenergic receptors are alpha, beta 1 and beta 2.
-Epinephrine and norepinephrine are released by the adrenal medulla and nervous system respectively. They are the flight/fight hormones that are released when the body is under extreme stress. During stress, much of the body's energy is used to combat imminent danger.
Sound waves reflecting off of objects
