Patients on dialysis are often restricted in cow's milk due to its high content.
a. phosphorus and potassium
b. vitamin d and calsium
c. protein and iron
d. sodium and vitamin a

A) Phosphorus and potassium

Explanation:

Patients on the dialyses are restricted from the cow milk due ti high phosphorous and potassium content as, it is the low fat milk which basically avoided because it is not good for health during the dialysis. Presence of high amount of phosphorous converting into the dangerous calcium which weaken our bones. Excessive intake of potassium also harmful for the patients.

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.

the dna molecules have a negative charge because of the phosphate groups in their sugar-phosphate backbone, so they start moving through the matrix of the gel towards the positive pole. power is turned on and dna fragments migrate through gel (towards the positive electrode).

explanation: