Which two topics are discussed in the notes?

• A. The notes discuss neutron skins in atoms and mimicry in animals.
• B. The notes discuss plate tectonics and climate change.
• C. The notes discuss photosynthesis and respiration.
• D. The notes discuss gravity and motion.

Answer: (A)

Two topics covered are neutron skins in atoms and mimicry in animals. Neutron skins describe how neutrons can form a slightly thicker layer around a heavy nucleus, affecting nuclear properties and how atoms interact with other matter. Mimicry in animals is an evolutionary biology concept where an organism imitates features of another to gain protection or advantage. The pairing of a physics/chemistry idea with a biology idea explains why this option best fits the notes. The other choices bunch topics from the same field (Earth science, biology, or physics), which would be less consistent with notes that mix distinct disciplines.