21. The primary topic of the passage is which of the following?
The interaction of the realms on the quantum ladder
Atomic structures found on Earth, on other planets, and on the surfaces of stars
Levels of energy that are released in nuclear reactions on Earth and in stars
Particles and processes found in the atomic, nuclear, and subnuclear realms
New types of particles occurring in the atomic realm
22. According to the passage, radioactivity that occurs naturally on Earth is the result of
the production of particles that have no detectable mass or electric charge
high energy exchanges on the nuclear level that occurred in an ancient explosion in a star
processes that occur in the center of the Sun, which emits radiation to the Earth
phenomena in the atomic realm that cause atoms and molecules to decompose into nuclei and electrons
high-voltage discharges of electricity that took place in the atmosphere of the Earth shortly after the Earth was formed
23. The author organizes the passage by
making distinctions between two groups of particles, those that are elementary and those that are composite
explaining three methods of transferring energy to atoms and to the smaller particles that constitute atoms
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