B. numbers of protons.
C. numbers of neutrons.
D. types of subatomic particles.
C. numbers of neutrons.
Compared to atoms of the same element, isotopes have differentnumbers of neutrons. They are variation of the same element. Often isotopes are radioactive, as they are not stable element, and they have various uses: for example, the isotope of the Carbonium with 14 neutrons - C14 - is used to calculate the date of certain ancient objects.
The equator is similar to the prime meridian in a way that both the prime meridian and equator are imaginary base lines from which locations of earth can be measured. The correct option is B.
The equator is a hypothetical line hypothetically drawn on the globe that divides it into the northern and southern hemispheres and marks the latitude 0° parallel. It is situated equidistant from the poles.
Prime meridian in a geographic reference system, a prime meridian is any line of longitude when longitude is defined to be 0°.
The Northern and Southern Hemispheres are divided by the Equator. At 0° latitude, the Equator is located. The Prime Meridian travels through Greenwich, England, at latitude 0°.
Thus, the correct option is B.
Learn more about Equator, here:
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B) oil drilling
C) cattle industry
D) sugar plantations