One of the differences between Lyme disease and Rocky Mountain spotted fever (RMSF) is that:
A. Lyme disease is transmitted by mosquitoes and RSMF by ticks.
B. Lyme disease is caused by a bacterium and RSMF by a rickettsial agent.
C. Lyme disease is caused by a rickettsial agent and RSMF by a bacterium.
D. Lyme disease is transmitted by ticks and RSMF by fleas.
E. None of the above.

B. Lyme disease is caused by a bacterium and RSMF by a rickettsial agent.

Explanation: Rocky Mountain spotted fever is characterized by a sudden, unrelenting and quickly escalating fever and headache and a rash that usually starts on the wrists and ankles. In contrast, the fever and aches associated with Lyme disease will wax and wane, and the circular rash will go away without treatment.

D

Explanation:

Ticks spread Lyme disease through a bite

the relative atomic mass of an element is the mass of one atom of that element, relative to 1/12th of the mass of a  1212c atom. to convert to an absolute mass in kg, it is necessary to multiply by  1.661×10−271.661×10−27.

the relative atomic mass is roughly equal to the number of neutrons, plus the number of protons, in the nucleus of the atom.

for elements with more than one stable isotope (different types of nucleus with different numbers of neutrons but the same number of protons), the quoted mass is usually the average mass, weighted by the relative abundance of the different isotopes.

hydrogen is a compound or a single element and a element is a pure substence that cannot be separated into simpler subtances

clorine is a compound its a chemical substance that forms when two or more different elements combine

so both hydrogen and clorine are compounds