Respuesta :
Answer:
The first one has to be the answer
Explanation:
If the area had once been covered by ice or snow, then there would be no place to get the warm leaf from.
If the area was once underwater then I don't know how it would have grown a cold forest, a tropical forest, and then a desert.
It'd make more sense if you started with a cold forest with sharp leaves, that slowly became a warmer forest with smooth leaves, only so it could become a dessert with only leaf fossil remains.
so ya the first one is your answer.
The climate changed from cool forest to hot desert is the hypothesis which can be concluded.
What is Hypothesis?
This can be defined as a proposed explanation for a particular phenomenon through various sources.
We were told that the toothed-edged leaf is from a forest in a cooler climate but was found in the desert which therefore means that the climate changed from cool forest to hot desert.
Read more about Hypothesis here https://brainly.com/question/10854125