The right answer is the option a, part of a binary system<span>. A binary system is two astronomical bodies which orbit one around each other due to the gravitational atraction that they mutually exert on each other. . On the other hand, Sun is a yellow star, a main sequence star and of average absolute magnitude. </span>
"The taller you are, the faster your heart rate." This hypothesis is testable, but not experimental.
Cells. Because they are the smallest living organisms on earth.
The red and violet blue colors