The answer to these questions lies in the fact that [______] density is much higher in the tropics than it is in temperate and cold climates.
동의어 · germ, microbe, infectious agent파생어 · pathogenic(병원성의)
★ 주제문 — S3·S4·S5·S6·S7이(가) 이 문장을 떠받칩니다 — S1을(를) 맥락(으)로 뒷받침