Pacemakers can adjust the rate of stimulation to the heart in response to levels of physical activity. Outline the conditions where this may be necessary and suggest ways it might be accomplished. Thank you!

nucleic acid molecules are incredibly complex, containing the code that guarantees the four different nucleotide units comprise dna, the nucleic acid of interest to the genealogist. and one of four nitrogen-containing molecules called nucleotides

the correct answer is anaphylaxis.

anaphylaxis is a condition caused by insect bites, foods, medications, manifested by tongue swelling, shortness of breath, vomiting, low blood pressure. it sometimes may occur without an obvious reason. it is treated with epinephrine injection.other tretments include antihistamines and steroids,

i would think a oil tanker that has leaked in a bay