Outline 3 possible reasons (given in the video) for the decline in the populations of Aspen Trees in Yellowstone Video name: National Geographic Strange Days on Planet Earth Part 3 of 4 Predator

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.

1. efficient use of space

2. elimination of groundwater contamination

3. energy generation

4. lower carbon footprint

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