What is el niño and how does it affect the climate​

El Nino causes the Pacific jet stream to move south and spread further east. During winter, this leads to wetter conditions than usual in the Southern U.S. and warmer and drier conditions in the North. El Nino also has a strong effect on marine life off the Pacific coast.

when a reversible reaction is occurring in both directions at the same rate; the products and reactants do not change in concentration. a chemical reaction where the compound is broken into its constituent parts.

this is true, assuming that the allele is completely recessive and incomplete dominance is not a factor.