condensation
The cloud must get really full and get very dense and then precipitation falls.
Before water vapor falls from clouds as rain, it must first condense into water droplets. This condensation occurs when the water vapor in the air cools and reaches its dew point, at which point it forms visible clouds. Once the water droplets in the clouds combine and grow large enough, they fall to the ground as precipitation in the form of rain.
DNA replicates and forms tetrad—APEX.
An electron must absorb or release a specific amount of energy, typically in the form of a photon, to move to a new energy level in the electron cloud. This process is known as electron excitation or de-excitation.
A certain size to fall - color is irrelevant.
For precipitation to occur, cloud droplets must grow in size and become heavy enough to fall out of the cloud as precipitation. This can happen through processes such as collision and coalescence, where cloud droplets collide and merge together, or through the process of ice crystal formation when the cloud is cold enough. Once the droplets grow large enough, they will fall as rain, snow, sleet, or hail, depending on the atmospheric conditions.
The flowers must be open and contain ripe pollen.
To be classified as a tornado, a funnel cloud must make contact with the ground. Once the funnel cloud touches the ground, it becomes a tornado and is classified based on its size, intensity, and associated damage.
It must die.
the congress must approve
Nitrogen must be in the compound form before it is used by plants or animals
a reveiw of what is known about the subject must occur