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Part One Cell Structures and Functions
120 other sections not shown
adapted adult algae amino acids amount arteries arthropods bacteria blood vessels body bones brain called capillaries carbohydrates carbon dioxide cause cavity cent chemical chromosomes color contains contraction cord cycle digestive tract diploid disease ectoderm embryo energy environment enzymes evolution evolved fibers Figure fish fluid fossil function gametes gametophyte gastrulation genes genetic glands glucose grow growth hair haploid heart hemoglobin hormone human impulses increase insects intestine kidney known layer liver living lower lungs mammals meiosis membrane ment metabolism mitosis molecules muscle mutations nerve neurons normal nucleus occur offspring organs oxygen pair phloem photosynthesis phylum plants and animals plasma present pressure primitive produced proteins protoplasm protozoa reaction red cells reproduction result root salts secrete seed skin species sperm spinal spores sporophyte stem stimulated stomach structure substances sugar surface tion tissue tube types ventricle vertebrates vitamin wall xylem zygote