Explain how and why each of the following became extinct or endangered
What will be an ideal response?
? Passenger pigeon—Because of the bird's large numbers, they were considered a pest. They were also considered
a cheap source of meat. Loss of habitat was also a factor.
? Carolina parakeet—People collected the brightly colored feathers.
? Heath hen—This animal was used as food supply. A few surviving birds were placed in a sanctuary, but a fire
swept through the area and killed all but a few males.
? Labrador duck—The feathers were used to stuff pillows.
? Bighorn sheep—The main causes of endangerment are from overhunting and disease.
? Polar bear—Fur collectors, using high technology to trap and kill the animal, are leading it to its decline. Loss
of habitat is also a problem.
? Key deer—Trophy seekers over hunted the deer, causing its numbers to decline.
? Wolf—The belief that wolves are dangerous has caused people to overkill wolf packs.
? Mountain lion—Fur hunters using dogs caused the lion to become endangered.
? Whooping crane—The crane is an easy target for hunters.
? Bald eagle—People believed that the eagle fed on salmon, so a bounty was placed on the bird. (As an interesting
note, by the time environmentalists succeeded in getting DDT banned, bald eagle populations were increasing
rapidly because the bounty had been repealed and killing bald eagles had been outlawed in the United States.)
? Ivory-billed woodpecker—Bird collectors wanted stuffed samples of the largest woodpecker in North America.
It may be extinct, but there have been reported sightings.
? Prairie chicken—Droughts, increased hunting, and human populations have caused the decline of the prairie chicken.
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________: the change in investment with respect to the change in interest rates.
Fill in the blank(s) with the appropriate word(s).
The inner and outer surfaces of a 25-cm-thick wall in summer are at 27°C and 44°C, respectively. The outer surface of the wall exchanges heat by radiation with surrounding surfaces at 40°C and by convection with ambient air also at 40°C with a convection heat transfer coefficient of 8?W/m2•K. Solar radiation is incident on the surface at a rate of 150?W/m2. If both the emissivity and the solar absorptivity of the outer surface are 0.8, determine the effective thermal conductivity of the wall.
What will be an ideal response?
What are the indications a check valve has stuck closed on an outside coil?
What will be an ideal response?
The ash pit is a space below the ash dump in the base of the fireplace where the ashes can be stored.
Answer the following statement true (T) or false (F)