Frogs undergo metamorphosis. Most species begin life as tadpoles resembling fish. Tadpoles breathe through gills, have a two-chambered heart, no limbs, and a tail designed for swimming. During metamorphosis, which of the following changes occur?
A. The heart changes to a three-chambered organ
B. The gills are replaced by lungs
C. Limbs grow and the tail is resorbed
D. All of the above
E. A and B above
D
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Pressure entering the compressor that is too high will cause the density of suction gases entering the compressor to increase.
Answer the following statement true (T) or false (F)
Research shows that the more chemicals there are in the air, the harder ____ work to remove them,
with rates of removal dropping when levels of toxins subside.
a. VOCs c. air purifiers b. plants d. humidity levels
Which of these actions is taken to prevent over-pressurizing the torch hoses during equipment setup?
a. Opening the tank valve slowly. b. Turning the regulator adjusting screw counter-clockwise (out). c. Turning the regulator adjusting screw clockwise (in). d. Installing flashback arrestors.
Two technicians are discussing coil springs. Technician A says that coil springs are installed on semi-trucks. Technician B says that coil springs can be variable rate to handle additional loads. Who is correct?
A. A only B. B only C. Both A and B D. Neither A nor B