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activities algae allele amino acids animals arthropods atoms auxin bacteria behavior biological birds blood body bonds brain capillaries carbon dioxide cavity cell membrane cell wall changes Chapter characteristic chemical chromosomes color contains cortex cycle cytoplasm digestive egg cell electron embryo energy environment enzymes eukaryotic evolution evolutionary example female fertilized fibers Figure flagella flower fluid forest fossil function fungi gametes gametophyte gene genetic glands glucose grow growth haploid hemoglobin hormone human hydrogen increase insects intestine involved known layer leaf light living systems male mammals meiosis micrograph mitochondria mitosis molecules move muscle nerve nitrogen nucleus occur organisms oxygen pairs percent phloem phosphate photosynthesis pigment plants pollen population pressure primates produced protein reactions receptors released result roots seeds sensory sexual soil species sperm spores sporophyte stimulates structure substances sugar surface temperature tion tissues tube types vertebrates xylem