Though most of these are correct, I personally think that 'g' is the best answer.
Answer:
Hey there!
The correct answer would be B. Background extinctions are a normal part of stable ecosystems.
Hope this helps :)
Answer: a
Explanation: just did it on edg
Eukaryotic cells have a nucleus
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.
