Why is predation important?
What will be an ideal response?
ANS:Predation
is important because it helps control wildlife populations. For example, foxes are necessary
to keep populations of rodents and other small animals under control. Populations of predators and
prey tend to fluctuate widely. When there is an abundance of predators, prey become scarce because of
overfeeding. When prey become scarce, predators may starve or move to other areas. This permits the
population of the prey species to increase.
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In 2007 the world’s population was estimated to be 6.7 billion people. The UN forecasts the population will begin to level off at 9.2 billion people in 2050. What is the population growth rate in percent over this period of time?
What will be an ideal response?
Hard hats should be made of fiberglass or _____
a. metal b. reinforced plastic c. styrofoam d. rubber
A vehicle failed an emission test due to high carbon monoxide and hydrocarbons in the exhaust gas. What could be the cause?
A) Overfilling the fuel tank B) Saturated EVAP charcoal canister C) Either A or B D) Neither A nor B
Answer the following statement(s) true (T) or false (F)
1. A 1° temperature difference in Celsius is equal to a 1° temperature difference in Fahrenheit. 2. For both the forced and the free convection situations, the overall heat transfer rate between the fluid and the surface is governed by Fourier's law of cooling. 3. All matter emits thermal radiation. This rule is true as long as the body in question is at a nonzero absolute temperature. 4. Most conventional fuels that we use today to generate power come from coal, natural gas, oil, or gasoline. 5. A degree-day (DD) is the difference between 65°F (typically) and the average temperature of the outside air during a 24-hour period.