Which is not a major similarity or difference between freshwater and marine ecosystems?
a. both support a large number of plants and animals adapted for aquatic living
b. ocean and freshwater system conditions generally remain constant throughout the year
c. freshwater ecosystems have a very low salt concentration, and include ponds, lakes, streams, wetlands, and rivers
d. saltwater ecosystems have a high salt concentration and include oceans, coral reefs, and estuaries

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.