Black Friday: lifetime access is on a special offer in the app, until November 30. Black Friday: special offer on lifetime access, until November 30. Download
식물은 향지성으로 땅의 중력 방향으로 자랍니다.Sigmureun hyangjiseongeuro ttang-ui jungnyeok banghyang-euro jalabnida.Plants grow geotropically towards the direction of gravity.