What defines the upper and lower boundaries of subalpine ecosystems in california, and how do these vary across the state? (word limit 150)

Answer and Explanation:

the upper boundary of sub alpine ecosystem is known as tree line and lower boundary of sub alpine ecosystem is known is montane zone the tree line is the edge of habitat at which trees are capable of growing it is found at very high elevation beyond this there is no life of treesthe upper montane zone is vegetarian type generally found above the mixed coniferous forest and bellow the sub alpine forest

HOW DOES IT VARIES ACROSS THE STATE :

the marginal conditions make the sub alpine ecosystem sensitive to environment change the long lived nature of the sub alpine species make the zone a good study system

It is the second answer

The answer to the question is moraine