(Q).
Q: What makes toenails and fingernails hard? Read this paragraph and choose the correct option from the provided answers: Fingernails and toenails consist of specialized epidermal cells that are filled with keratin. The keratin makes them tough and hard, which is important for the functions they serve. Fingernails prevent injury by forming protective plates over the ends of the fingers. They also enhance sensation by acting as a counterforce to the sensitive fingertips when objects are handled. Choices: - guanine - cellulose - taurine - keratin A:
(A).
keratin

(Q).
Q: What term describes waves that travel through matter? Read this paragraph and choose the correct option from the provided answers: Waves that travel through mattersuch as the fabric of a flagare called mechanical waves. The matter they travel through is called the medium. When the energy of a wave passes through the medium, particles of the medium move. The more energy the wave has, the farther the particles of the medium move. The distance the particles move is measured by the wave's amplitude. Choices: - replaced waves - water waves - heat waves - mechanical waves A:
(A).
mechanical waves

(Q).
Q: What process can be triggered by a burst of ethylene production in the fruit? Read this paragraph and choose the correct option from the provided answers: Choices: - pickling - hardening - drying - ripening A:
(A).
ripening