The earth has biogeochemical cycles that recycle life materials and are essential to the
a.)biosphere
b.)hydrosphere
c.)lithosphere
d.)cryosphere

Biosphere.

Explanation: The biosphere consists of all the living and non living life forms.The biochemical cycle is important for all the living forms as it provides nutrients.

This nutrient is important for the process known as photosynthesis that provides food to all the living beings.

The nitrogen, phosphorous and carbon are equally important for the plants as well as animals as it helps in the recycling of the nutrients.

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- all cells come from pre-existing cells