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activities algae amino acids amoeba animals arthropods atoms auxin bacteria become behavior birds blood body bonds brain cavity cell membrane cell wall centrioles chain characteristic chemical Chlamydomonas chlorophyll chloroplast chromosomes cilia coelenterates coelom colony color complex contains cycle cytoplasm cytostome digestive egg cell Electron micrograph embryo energy enzymes epidermis example female fertilization fibers Figure fish flagella flagellum flower fluid function fungi gametes gametophyte gene genetic gills glands glucose grow growth haploid hormone Hydra hydrogen insects ions known larva layer light living male mammals material meiosis mesoderm mitochondria mitosis molecules move muscle mutants nerve neurons nucleotides nucleus nutrients organisms outer oxygen pair particles pigment planarian produced protein reaction released reproductive ribosomes seed sensory shell shown skin species sperm sponge spores structure substances sugar surface tion tissue tube tubules types vacuoles vascular vertebrates xylem zygote