A person moved the ends of two magnets together and felt them attracting each other. Which is the most accurate description of the magnetic poles involved? A. Both ends must be magnetic north poles only. B. Both ends must be magnetic south poles only. C. The ends must be either both magnetic south poles or both magnetic north poles. D. One end must be a magnetic north pole and the other a magnetic south pole.

the answer is d

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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.