Explain and illustrate how the long-term survival
of a species depends on resources that may be
limited from time to time.

Answer and Explanation:

When there is limitation to resurces, there are behavioural activities that organisms perform like clustering, coiling, burrowing, migration, hibernation and aestivation.

Migration is seen in many homoitherms where there is movement over long distances to avoid unfavourable climatic factors and food shortage. During cold weather, large mammals survive by hibernating. They go into deep sleep and metabolic rate falls to the minimum required for maintaining the vital activities of the cells.

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.

enzyme active site and substrate specificity

enzymes bind with chemical reactants called substrates. there may be one or more substrates for each type of enzyme, depending on the particular chemical reaction. in some reactions, a single-reactant substrate is broken down into multiple products