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PRINCIPLES OF BIOLOGY
BIOLOGY OF ANIMAL LIFE
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abdomen adapted adult ameba bacteria bees beetles biology birds body bones Botany brain breathe buds butterfly called carbon dioxide caterpillars cavity centrosome chromosomes color contains covered crayfish crustaceans developed digestive disease earthworm eggs enemies euglena excretion feed female FIGURE fish flowers following incomplete statements frog fruit germs gills glands grasshopper green grow growth habitat hair hatch hydra insects intestine kinds known larvae layer leaf leaves legs living things lungs mammals membrane Micronucleus microscope milk monarch butterfly mosquito moth mouth muscles nerve nest nucleus organs oxygen pairs paramecium parasites plants and animals poison pollen produced protection protoplasm protozoa pupa region reproduction reptiles respiration roots seeds skin soil sperm cells spider spores stem stomach stomata structure substance tadpoles tail teeth tiny tissue trees tube vacuoles vertebrates Vitamin waste wings worms yellow young