The Earth's winds are caused by uneven heating of the atmosphere by solar radiation. The uneven heating causes air masses to have different temperatures and densities. Which of the following correctly explains how these differences cause the air masses to move?

B.

Explanation:

Warmer, less dense air masses rise in the atmosphere; colder, denser air masses sink in the atmosphere.

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."

producers within ecosystems are essential as they are at the base of the food chain. plants are examples of producers. they use the process of photosynthesis to capture light energy and use it to convert simple inorganic substances (carbon dioxide and water) into organic substances (glucose).