Why is the balance of nature a myth?
What will be an ideal response?
ANS:The
balance of nature is a myth because wildlife communities are seldom in a state of equilibrium. The
numbers of various species of wildlife are constantly increasing and decreasing in response to each
other and to many external factors such as natural disasters. These include fires, droughts, and disease
outbreaks. Interference of humans often upsets sensitive relationships in nature.
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A check valve arranged and trimmed for installation in a drain line that is used to control backflow is a
A. needle valve B. gate valve C. backwater valve D. diaphragm valve
General Purpose Acme threads:
A) Generally have very poor finishes so fits are not important B) Have the same clearance at the root and the flank C) Bear at the major diameter D) Bear at the flanks
Which statement regarding drive-on ramps is correct?
A) They tend to "kick out" when driving up the ramps B) The wheels on the ground should be chocked to prevent vehicle movement C) Both A and B D) Neither A nor B
What happens to the air pressure drop across the outdoor coil as it becomes blocked with frost?
A) The air pressure drop across the coil increases B) It is not possible to measure the air pressure drop across the outdoor coil C) The air pressure drop across the coil decreases D) The air pressure drop across the coil is not affected by frosting