Christian, a 14 year old boy, has a resting heart rate of 76 beats per minute. using the lower and upper limit reserve training percentages of 50% and 85% respectively, what is christian’s target heart rate range?

Why do rna viruses appear to have higher rates of mutation? a) rna nucleotides are more unstable than dna nucleotides.b) replication of their genomes does not involve proofreading.c) rna viruses can incorporate a variety of nonstandard bases.d) rna viruses are more sensitive to mutagens.

Which of the following is an organ in the endocrine system? question 9 options: pituitary gland trachea pharynx brochus

(i think the answer is a, am i right? ) most regulatory signs are a. octagonal and red or white b. circular and blue or green c. rectangular and red or white d. rectangular and yellow