Why is Carbon so essential to life? Carbon dates back to the beginning of life, making it the oldest element with proof of life.

Carbon has four valence electrons, helping it bond to itself as well as many other elements which creates unique shapes and scenarios.

Carbon is in all the foods we eat, helping it recreate our DNA backbone, and therefore, making our bones and organs stronger.

Carbon is the main essential nutrient in water, helping it sustain life overall.

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.

a scenario where a cell may be needed to perform a form of endocytosis is when transporting large molecules. a scenario where a cell may be needed to perform a form of exocytosis is when releasing the large molecule from the cell.