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activities algae amino acids amoeba animals arthropods atoms auxin axon bacteria behavior birds blood body bonds brain cavity cell membrane cell wall centrioles CHâ‚‚ chain chemical chloroplast chromosomes cilia coelenterates coelom colony complex contains cycle cytoplasm digestive division egg cell electrons embryo energy enzymes epidermis evolutionary example female fertilization fibers Figure fish flagella flower fluids function fungi gametes gametophyte gene genetic gills glands glucose grow growth haploid hormone Hydra hydrogen insects known larva layer living male mammals material meiosis mesoderm micrograph mitochondria mitosis molecules move muscle mutants neurons nucleotides nucleus organisms outer oxygen pair particles phloem photosynthesis pigment planarian plants produced protein protons pyruvic acid reaction released reproductive ribosomes seed sensory shell shown species sperm sponge spores structure substances sugar surface tion tissue tube tubules types vacuole vertebrates xylem zygote