Examlex
Instructions: Please define the following key terms.Show Who? What? Where? When? Why Important?
-Ptolemies
Psilotum
A genus of fern-like plants belonging to the whisk fern family (Psilotaceae), known for lacking true roots and leaves.
Angiosperms
A large group of flowering plants that develop seeds within an enclosed ovary.
Gymnosperms
A group of seed-producing plants that includes conifers, cycads, Ginkgo, and gnetophytes, characterized by seeds that are not enclosed by a fruit.
Chitin
A large, structural polysaccharide made from chains of modified glucose and found in the exoskeletons of arthropods and in the cell walls of fungi.
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