The answer is in the question. Fire must be harmful to them. Pine trees, and other conifers have high levels of substances called turpines in their leaves. This serves two maior purposes, to make them taste foul (few animals graze on pine leaves) and to act as a kind of anti-freeze, so the leaves work all year round, even in subarctic conditions.
However, turpines are highly flammable, so pine saplings will rarely survive a grassland fire. The saplings don't survive on the grassland and the trees don't encroach.
cus grass lands don't have enough water to grow trees
very few trees exist in grasslands, but there are some. No pine trees though.
No, Pine Trees have pine needles, not leaves
Pine trees of course!
A plantation (area of trees) of pine trees
It is distilled from the resin of trees. Mostly from pine trees.
Pine trees have quite a few things that fern and mosses do not. Pine trees have pine cones and a wooden trunk.
No, there is only pine trees in pine forests. I think?
Natural, Pine comes from pine trees and trees grow naturally!
no, pine trees are gymnosperms and only produce cones, never flowers
4 to 6 is the pH of pine trees
It is called the Pine Tree State because it has a LOT of pine trees.
$700