I believe the answer is "D"
A stationary front is depicted in the picture at L. A stationary from is a narrow zone separating two air masses in which neither air mass is displacing the other. When this occurs there is a stall in the motion of the front. The blue triangles point away from the cold air and the red semicircles point away from the warm air.
Secondary is the answer I think!
The explanation that best explains why the seeds did not produce a tree
would be “The oak grows in Ohio, which is a temperate forest biome. Tucson is a
desert biome. Therefore the oak seed could not cope with the changed climate
and did not grow.” I am hoping that this answer has satisfied
your query and it will be able to help you in your endeavor, and if you would
like, feel free to ask another question.
