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characteristics (Birds (2 main function ; (flight, insulation), contour…
characteristics
Birds
contour feathers : feathers that covers the body , wings and tail
down feathers : soft ,located beneath contour
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circulation : 4 chambered heart , 2 upper atria , 2 lower ventricles
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digestion steps : 1) swallow 2) store in crop 3) food moves to stomach 4) at the posterior end of the stomach there's a thick ,muscular sac called gizzard
5) gizzard crushes food
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Fishes
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Vertebral columns: functions as a strong, flexible rod that muscles can pull against during swimming or running.
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Scales
Ctenoid scales – made of bone and skin
Cycloid scales – made of bone and skin
Placoid scales – made of tooth-like material
Ganoid scales – made of enamel and bone
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Amphibians
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Have gills as tadpoles , and lungs as adults
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