Which definition best describes global warming?
a. a long-term change in the earth's climate
b. a long-term increase in the earth's average temperature
c. a long-term change in the climate of a region or a city
d. solar heat that is radiated out into space

 B a long-term increase in the Earth's average temperature

B

Explanation:

i would say the prokaryotic cells the prokaryotic cells are less complex, are usually found only in unicellular organisms and have more limited capabilities than eukaryotic cells.

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."