Question

sort the words according to the meanings of their shared roots. dermatology protocol extraterrestrial protoplasm hypodermic protolanguage protohistory extrasensory skin outside first

Explanation:

• For the "skin" category: The root "derm" relates to skin. "Dermatology" is the study of skin, and "hypodermic" (hypo - under, derm - skin) relates to under the skin.
• For the "outside" category: The prefix "extra - " means outside. "Extraterrestrial" is outside Earth, and "extrasensory" is outside the normal sensory range.
• For the "first" category: The prefix "proto - " means first. "Protocol" (proto - first, col - draft), "protoplasm" (first form of matter in cells), "protolanguage" (first form of a language), and "protohistory" (the period before recorded history, first in the sense of early) all use the "proto - " prefix meaning first.

Answer:

• skin: dermatology, hypodermic
• outside: extraterrestrial, extrasensory
• first: protocol, protoplasm, protolanguage, protohistory