Atoms may have different numbers of neutrons. Atoms are the smallest fraction of an element that can exist, and still show the properties of the element. They consists of electrons (negatively charged), protons (positively charged), and neutrons (no charge). The number of electrons is equivalent to the number of protons normally however an atom may loose or pick up electrons and have a positive charge or negative charge. The number of neutrons in the nucleus may vary within a given element to give varieties of atoms we call isotopes.
The correct answer is A because G and C work together, and T and A work together, except A turns into U when transferring to mRNA.
To produce hormones and also to produce electrical impulses
The last option because it's like the earth
The magnification power level of the microscope
