Explain the difference between chromosomes, chromatids and chromatin. (3-4 sentences)

CHROMATIN : It can be simply referred to as genetic material in loose or normal form. It can be DNA or RNA inside the plant or animal cell's nucleus.

2. CHROMOSOME : When the chromatin material is condensed prior to the cell division and get highly organized form that can be visible in form of proper structures have two chromatids, they are called chromosomes.

The process of formation of chromosomes from chromatin occurs mainly in prophase of Mitosis or  Prophase II or Prophase I of Meiosis.

3. CHROMATID : Chromatid is also referred to as sister chhromatids since there are two chromatids present in one chromosome that are almost similar. Chromatids can be considered as arms of chromosomes which are attached at a point centromere (please see the image for better understanding).

Hope it help!

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.