Structures too small to be easily seen with the naked eye

The struggle against other organisms for needed resources

The main tissue of a trunk

The name of a young tree

The most destructive type of forest fire

The units through which characteristics are passed from parents to offspring

The range of conditions in which an organism can survive

The rough outer covering of a tree

This type of tree has several main branches close to the ground

A method of deforestation that involves removing all the trees from areas that are 100 acres or less

The molecule that stores genetic information in a cell

Any extreme condition outside an organism's tolerance range, which threatens its survival

The hard, dead, clogged wood at the center of a tree

The tallest tree species

Any system or object that absorbs carbon dioxide from the environment

A cell that contains cellulose, large vacuoles, and chloroplasts would belong to this organism

The maximum number of organisms of a particular species that an ecosystem can support

Wood is composed of this tissue

The oldest living organisms on earth

Tree growth in diameter

The "Father of Microbiology"

The idea that nature is god

The layer of growth cells just below the bark of a tree

A tree that loses its leaves in the fall and stays bare all winter

The first head of the US Forest Service