Which process allows water to enter the atmosphere?
evaporation
condensation
precipitation
freezing

The process through which water is introduced into the atmosphere is the evaporation.

Option A

Explanation:

The water is cycled in our ecosystem through the water cycle. The liquid water present in the ecosystem through various sources such as the river, lake, and pond are the hydrosphere of the earth.

These liquid water under the effect of sun goes heating and this causes the water to turn into vapour that is water vapour. These water vapour are then introduced in to the atmosphere. Later to which they condense to form the clouds.

the answer is; comparing the frequency of collisions with and without the device

this makes the anti-collision system an independent variable and the collisions a dependent variable. if there are fewer collisions with an anti-collision system that without, then it can be stated that the system is a success. essentially, collisions under an anti-collision system are compared with the frequency of collisions by cars with the human drivers.