In the late 1800s mendel predicted the existence of units of hereditary information or factors. what do we call these units of heredity information today

Genes are the units of hereditary information.  

Explanation:

Gregor Mendel is named the "father of Genetics". He proposed "theories of inheritance" based on his work on the pea plant, "Pisum sativum".  

The "theory of inheritance" states that discrete units of inheritance, which we now know as "genes", are passed from "parents to offspring as traits". A trait that masks or dominates over another trait was called the "Dominant trait" or allele and the one being hidden was called the "Recessive allele".  

explanation:

the universal gravitation equation. since the gravitational force is directly proportional to the mass of both interacting objects, more massive objects will attract each other with a greater gravitational force. if the mass of one of the objects is doubled, then the force of gravity between them is doubled.

answer: ice crystals in air

the water from the water body or another source of water gets evaporated as water vapor as an effect of heat on water. these water vapor rises in the upper layers of the earth atmosphere under high atmospheric pressure. the atmospheric pressure of these water molecules starts to decrease due to the effect of cold air. the invisible water vapor condenses into visible water droplets and ice crystals.these ice crystals and water droplets being less denser than the surrounding air floats on air as clouds.