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Chemistry and the cell
Protection support and movement
22 other sections not shown
acid adult algae animals appendages archegonia areas arthropods asexual bacteria birds blood cells blood vessels body bones carbohydrates carbon cavity characteristics chlorophyll chromosomes circulatory circulatory system Class coelenterates coelom complex cycle digestive tract disease dorsal eggs embryo energy environment example factors female fertilization fibers fish flowers forests forms fossil function fungi gametes gametophyte genes glands growth heart hormone hyphae important individual insects intestine kidney known large number larvae layer leaf living lungs male mammals materials membrane molecules mouth move movement muscle nerve nervous system notochord nucleus ovary oxygen pairs parasitic pharynx phloem photosynthesis Phylum planarians plants pollen portion posterior produced proteins protozoans reproduction reptiles respiration result root seed segments sense organs sexual skeleton skin soil species sperm sponges spores sporophyte stem structure Subphylum sugar surface temperature tion tissues tube tubules types usually ventral vertebrates wall worms xylem zygote