What can explain the formation of a rock layer with no fossils in between rock layers with different types of fossils?

Specific environments favor the presence of life forms, and their preservation to form fossils, than others.

Explanation:

The reason for the formation of a rock layer with no fossils in between rock layers with different types of fossils is that "Specific environments favor the presence of life forms, and their preservation to form fossils, than others."

For example, the environments in which a particular rock layer developed is likely to differ from the environment from which the subsequent rock layer is formed.

Therefore, one environment supports life forms and formation of fossils while the other doesn't. This can also be caused by the major difference in climatic occurrence or presence.

two jet streams that directly affect the formation of weather in the continental part are a polar jet and a subtropical jet. they are responsible for the transportation of weather systems, which directly affect people. the polar front is the boundary between cold air from the north pole and warmer equatorial air. both the polar jet and the subtropical jet blow from the west to the east, and follow the boundary between cold and warm air.

the strongest jet streams are polar jets, while subtropical jets are somewhat weaker.

the right answer is c. the polar jet stream is generaly stronger than the subtropical jet stream.