The medullary cavity is select one: a. empty in adult bones. b. the site where osteoblasts are found. c. lined with endosteum. d. filled with fibrocartilage and elastin fibers. e. dead space in the bone.

C- Lined with Endosteum

Explanation:

The medullary cavity, also called the marrow cavity, stores red and yellow bone marrow (or adipose tissue). It is the central cavity in the shaft of bones.

Endosteum lines the inner surface of the medullary cavity. It is a thin, vascular membrane of connective tissue with the purpose of being absorbed when a person is malnourished.

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.