How does groundwater become polluted? a. pollutants mixed with water pass through permeable layers above the aquifer. b. factories dump their waste directly into aquifers. c. refuse infiltrates the water table when garbage is dumped. d. all of the above select the best answer from the choices provided

The groundwater becomes polluted when the pollutants get mixed with water and pass through the permeable layers above the aquifer.  

One of the most essential sources of water for irrigation is groundwater. Unfortunately, groundwater is vulnerable to pollutants. The contamination of groundwater takes place when man-made components like oil, gasoline, chemicals, and road salts get into the groundwater and make it unfit for human consumption.  

the answer is A if you don't want to read that.

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.

b.have there own function.