Elements of biology; a practical Elements of biology; a practical text-book correlating botany, zoology, and human physiology elementsofbiolog00hunt Year: [c1907] ECOLOGY 145 deserts. The stem may be thickened and full of water; a covering of hairs or some other covering may occur and lessen loss of moisture by evapora- tion. Examples of xerophytes are the cacti, yuccas, agaves, etc. ^'sa^^f^''' :^S£Sft*Sfe*h: -*3^-^=f?c?^>-^ ,^&^_ â¢Â«. m. â¢3k ,1L â .-Jys.

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