Natural gas drilling locations are determined by

a.

random drilling

b.

seismic surveys

c.

natural gas dogs

d.

satellite surveys

b. seismic surveys

Seismic survey is an ideal method for determining the location of the natural gas. In this method the waves of energy are introduced on the under surface earth layers. These waves are bounce back the frequencies of these waves are recorded and the particular frequency which can be used to determine the location of the natural gas is determined.

tsd is temerature dependent sex determination.

tsd: it is a type of environmental sex determination in which the temperature experienced during embryonic/ larval development (ambient temperature for development) determine the sex of the offspring.

crocodile displays the tsd where the ambient temperature of the developing egg determines the individual's sex. for example in the american alligator's eggs, incubation at 33 ºc produces mostly males, while incubation at 30 ºc produces mostly females. so if the american alligator's egg will get the ambient temperature (33 degree celcius)during embryonic development from egg, the offspring will be male and same for the female sex determination.