What training approach requires special machines equipped with mechanical devices that provide differing amounts of resistance, with the intent of overloading the muscle group maximally through the entire range of motion?

The variable resistance training is a training approach which requires special machines equipped with mechanical devices that provide differing amounts of resistance. These devices have the intent of overloading the muscle group maximally through the entire range of motion. An example of which is when a lifter adds elastic bands to a lift. 

the answer is b. 0; 4

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.