What sort of weather conditions might exist during La Niña? warm winters in southeast, droughts in Australia floods in Africa, mudslides in California

a) Warm winters in Southeast

Explanation:

La Niña (the little girl in Spanish) is one of the two phases of El Niño-Southern Oscillation (ENSO) cycle,  which refers to changes in the temperature between the atmosphere and the ocean. This phenomenon is known as "the cold relative" of the other phase, El Niño (the little boy in Spanish), which is characterized by unusually warm oceanic currents in the Pacific.

During La Niña event, the Northwest of the United States is colder and the Southern part is drier. Moreover, the Southeast is characterized by warmer temperatures that wouldn't occur without the presence of this phenomenon.

In contrast, La Niña causes strong rainfall in Australia and Southern Africa.

c.) polymerase chain reaction

- "unlike the original dna fingerprinting method, dna profiling does not use restriction enzymes to cut the dna. instead it uses the polymerase chain reaction (pcr)? to produce many copies of specific str sequences. pcr is an automated procedure that generates lots of copies of a specific sequence of dna."