Why does crossing over occur more often between two distantly linked genes than between two closely linked genes on the same chromosome?

Nasa scientists must work together to make sure that everything is correct and accounted for when launching a shuttle. besides a physicist, what other type of scientist would be in making sure that the shuttle has the appropriate type and amount of fuel to reach its destination?

About how many years does it take for one cycle of surface water to become deep water and then surface water again in the oceans? 101001,000

Energy stored in the bonds that hold together the atoms and molecules of all substances is called a. kinetic energy. b. electrical energy. c. mechanical energy. d. chemical energy.