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activities algae allele amino acids animals arthropods auxin bacteria biological birds blood body bonds brain capillaries carbon atoms carbon dioxide cavity cell membrane cell wall chain changes Chapter characteristic chemical chromosomes color composed compounds contains cortex cycle cytoplasm develop digestive egg cell electron embryo energy environment enzyme eukaryotic evolution example female fertilized fibers Figure flagella flower fluid function gametes gametophyte gene genetic glands glucose growth heat hemoglobin hormone human hydrogen increase insects involved ions known layer leaf light living systems living things male mammals meiosis micrograph mitosis move muscle nerve nitrogen nucleotides nucleus occur organisms outer oxygen pairs percent phloem phosphate photosynthesis phylum pigment plants pollen population produced protein protons reactions receptors released result roots seed sensory shell soil species sperm spores sporophyte stimulates structure substances sugar surface take place temperature tion tissues tube types vertebrates water molecules xylem