The Biotic World and Man

acid activity adaptations algae allow areas arthropods auxin bacteria become biological biotic potential birds blood stream body bone brain buds capillaries carbon dioxide cavity cent changes characteristic chemical chlorophyll chromosomes coelenterates coelom complete cytoplasm digestive diploid disease embryo energy enzyme fertilization fibers fish forest fossil gametes gametophyte gills glands growth haploid hence hormone human individual insects intestine involved kinds land layer leaf leaves light living things lower lungs mammals mate materials mechanism membrane ment microscope mitosis molecules monocot muscle nerve neuron normal notochord nucleus organism oxygen pair parasites phloem Photo photosynthesis Phylum pigment plasma pollen polyploids produce proteins protoplasm reach region reproductive root salt seeds sense cells single skin soil species sperm spores sporophyte stem stimulation structure substances sugar surface temperature tion tissue trees tube ture usually vertebrates walls worms xylem