You are hiking through a wooded area when you come across a cave. since it is a hot afternoon, you decide to take a break inside the cool shade of the cave. you are surprised to find ferns and moss growing inside the entrance of the cave since you know that plants need sunlight in order to grow. how are these plants growing?

The entrance zone is as the name implies, the entrance to the cave. This section has the most activity in the form of wildlife and plant life. Upon entering the cave, one would notice that it has quite a bit of grass, trees, and plants leading into the cave since it has access to the most sunlight. There may even be some growing out from the rocks around the immediate entrance to the cave.

The second zone is the twilight zone. This part of the cave hosts low levels of sunlight. This section not ideal for plant growth has enough light to allow ferns, mosses, and other specialized species of plants can thrive.

Lastly, is the dark zone. The Dark zone location is at the very back of the cave. This part of the cave has no sunlight whatsoever. No plant could survive in this section of the cave.

a "theory" a suggestion that is not 100 % accurate, or a figure. some people say its a theory because they of all the passed theory's about one subject. it depends sometimes theory might be accurate and sometimes they are.

a- all cells come from pre-existing cells