Much research has taken place on the value of diversity of organisms in a given plot of land. What appears to be the value of such diversity?
What will be an ideal response?
The diversity of the ecosystem helps each one. Monoculture fields are brittle,
fragile. The more species share a system, the more stable the system is. Decreases in
diversity are correlated with decreases in productivity. Loss of diversity in plants can lead
the plants to be unable to respond to changes in the environment.
One reason for seed banks is the preservation of genetic diversity. That genetic diversity
could possibly be important to adaptation of the plant to a future, different environment—as
in a future warmer world.
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A 5.00 gram bullet has a velocity of 300 m/s. It strikes a block of wood and penetrates to a distance of 2.00 cm. The average force of the block of wood on the bullet is
A. 9,340 N. B. 11,250 N. C. 15,200 N. D. 19,500 N. E. 21,400 N.
Galileo found the rotation period of the Sun was approximately:
A) a day. B) a week. C) a month. D) three months. E) a year.
Three essential components of a nuclear reactor are: a fissionable fuel ,a coolant to transfer the heat, and
A) a "scrubber" to prevent radioactive isotopes from getting into the environment. B) a radioactive substance to keep the reaction going. C) tritium to speed up the neutrons. D) control rods. E) lead to stop the neutrons.
Two charged bodies separated by a distance d exert an electrical force on each other. The distance d is doubled. The electrical force on each body now
a. decreases by 1/4 b. decreases by 1/2 c. stays the same d. increases by 2 times e. increases by 4 times