1.More and 90 percent of the calcium in the human body is in the skeleton.A BCD 2.Perhaps the most popular film in movie history, Star Wars was written and direction by George Lucas.A BCD3.Some animal activities, such as mating, migration, and hibernate , have a yearly cycle.A BCD 4.Geographers were once concerned largely with exploring [...]

1.North American bison differ from domestic cattle in have 14 rather than 13 pairs of ribs.A BCD2.Female sea turtles, before laying her eggs, swim as much as 2,000 kilometers to return to the beaches where they themselves were hatched.A BCD3.Water is the only substance that occur at ordinary temperatures in all three states of matter: [...]