leaves fall out of trees because it is too cold for the trees to grow and be healthy. they do not get sunlight; and you know that trees need sunlight to live and grow, so the leaves fall out. but they need sunlight to MAKE SUGAR..so they eventually gome back and grow in the spring
Because the climate further to the North pole gets colder. Therefore the trees cannot get the right amount of what they need to grow but still get what they need to grow. So still grow just not as much
we need to save trees as they provide us oxygen for breathing. if we cut trees then the rate of pollution in the atmosphere will increase and the survival of organisms will not be possible. therefore trees are of great importance and we should grow more trees in our neighbourhood..
if trees were to grow under other trees , there would be a a mixture in the roots of the trees ,which will make it impossible for the trees to grow properly....i think that is why trees tend not to grow under other trees...