A bacteriologist is studying two asexually reproducing strains of E. coli. The two require different amounts of trace minerals for survival; on these grounds, the bacteriologist determines that they are separate species. In making his determination, he is using what species concept

Ecological species concept

Explanation:

Ecological species concept is one of the species concept that claims or explains that species is a set of organisms that are able to adapt to a particular set of resources in particular environment .

It should be noted that, because the strains of the E. coli require different amount of trace minerals for survival indicates that they are separate species, which are adapted different sets of resources of different environment.

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.