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feathers

(Encyclopedia) CE5 Structure of a bird feather feathers, outgrowths of the skin, constituting the plumage of birds. Feathers grow only along certain definite tracts (pterylae), which vary in…

paleontology

(Encyclopedia) paleontologypaleontologypāˌlēəntŏlˈəjē [key] [Gr.,= study of early beings], science of the life of past geologic periods based on fossil remains. Knowledge of the existence of fossils…

Homework Center: Life Sciences

Subjects » Geography » History » Language Arts » Mathematics » Science » Social Studies Homework Skills Writing | Research Speaking & Listening Studying Reference Sources Almanac…

Homework Center: Life Sciences

Subjects » Geography » History » Language Arts » Mathematics » Science » Social Studies Homework Skills Writing | Research Speaking & Listening Studying Reference Sources Almanac…

Biggest Animal Hall of Fame

Biggest   Follow this slideshow to see images of and learn about the worlds' largest land and marine mammal, bird, fish, reptile, and insect. Prev Next Land mammal African elephants…

mass extinction

(Encyclopedia) mass extinction, the extinction of a large percentage of the earth's species, opening ecological niches for other species to fill. There have been at least ten such events. The five…

mammal

(Encyclopedia) mammal, an animal of the highest class of vertebrates, the Mammalia. The female has mammary glands, which secrete milk for the nourishment of the young after birth. In the majority of…

Year in Review, 2014

Top events for the nation and the   world                                          News and Analysis News of the Nation                  Take a look back at the major national…

Shark Facts

Fast Facts on Sharks How is a shark different from other kinds of fish? by Holly Hartman Sharks are fish. But how is a shark different from other kinds of fish? Most other fish have…