Organisms typically have more than one form of each gene. if one form can mask the appearance of another form, that form is considered the other form.

dominant

Gene is the unit of inheritance. A gene is responsible for the expression of genotypic and phenotypic traits in an organism. Each gene exhibit two distinct forms of alleles. The allele can be dominant or recessive depending upon the expression. The dominant gene mask the effect of the recessive gene. Hence, the expression of trait in an organism is also in accordance with the dominant allele.

come closer and become far apart and become steam/gas

float.

archimedes' principle

denser than water sinks in water.

denser than mercury would sink in it