Question

sort the words according to the meanings of their shared roots.
cardiac armadillo myocardium
rearm disarm armor
heart shield

Explanation:

• For the "heart" category: The root "cardio-" or "cardi-" relates to the heart. "Cardiac" pertains to the heart, and "myocardium" is the muscular tissue of the heart (the prefix "myo-" means muscle, and "cardium" relates to the heart).
• For the "shield" category: The root related to "armor" or "shield" is seen in words like "armadillo" (a creature with a protective shell like a shield), "rearm" (to equip with arms/shields again), "disarm" (to take away arms/shields), and "armor" (protective gear like a shield).

Answer:

• heart: cardiac, myocardium
• shield: armadillo, rearm, disarm, armor