contents
the animal kingdom, 7
animals without backbones-the invertebrates, 9
PROTOZOA, 10
SPONGES, 12
COELENTERATES, 13
FLATWORMS, 16
ROUNDWORMS, 16
SEGMENTED WORMS, 16
MOLLUSKS, 17
ARTHROPODS, 19
ECHINODERMS, 20
animals with backbones-the vertebrates, 22
FISH, 22
AMPHIBIANS, 24
REPTILES, 26
BIRDS, 28
MAMMALS, 30
all animals have evolved from simpler ancestors, 33
animals of the past, 36
animals are adapted for food getting, 39
animals have structures for protecting themselves, 42
some animal homes, 45
some animals live together, 47
animals change with the seasons, 48
all animals reproduce, 53
some animals care for their young, 56
animals useful to man, 60
life on other planets, 64
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