The potential evapotranspiration is determined by

Availability and sufficient water (ample water).

Evapotranspiration can be defined as the sum of evaporation and plant transpiration from the earth surface into the atmosphere which includes soil evaporation and vegetation. Thus, Potential evaporation is the energy that is available to evaporate and transport water from the ground into the atmosphere. However, the potential evapotranspiration can determined by the availability and sufficient water (ample water).

"do a testcross with a homozygous recessive plant."

blue stars have the highest surface temp

stellar distances are usually expressed in light-years

the measure of a star's brightness is called magnitude

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