Neurons are amitotic, which means that after a certain stage, they do not divide further. most tumor cells are

neuroglial cells;  since neuroglial cells are capable of mitosis

Complete question: “Neurons are amitotic,  which means that, after a certain stage, they do not divide further.  Most tumor cells are characterized by a rapid rate of mitosis. Based on this, of which cell types brain tumors be composed (neurons or neuroglia)? Why”

Brain tumors are composed of neuroglia, the non-neuronal cells in the central nervous system that maintains homeostasis, form myelin,  provide support and protection for neurons and capable of mitosis.

Tumor cells multiply relentlessly in the absence of growth-promoting factors for proliferation of normal cells and resistant to signals that program apoptosis. Cancer cells continue to produce copies when there is no need. The copies continuously divide serving no purpose. It can also spread to nearby and distant tissues.

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.