This document discusses plant classification and adaptation. It describes the different types of plants from the smallest that need microscopes to see to the largest trees. It explains the divisions of spermatophytes into gymnosperms and angiosperms, and then further divides angiosperms into monocots and dicots. It also describes plants that do not produce seeds like algae, fungi, bryophytes, and pteridophytes. In addition, it provides examples of plant adaptations and uses of plants for medicine.