Hey There!
Here is your answer:
Your answer is that a experiments should be controlled because the experiment could go out of control which could harm or hurt someone.
Also the definition of a controlled experiment is a part of the experiment that's not touched.
Ex: Water is your controlled experiment that's because our not doing anything to the water.
If you need anymore help just ask me!
Hope this helps!
Answer:
it is only used to view a dead specimen
A lot of cells are needed to create a living organism. infinity cells are needed
For air masses to form fronts, they must collide with each other. B.
<span>Climax community=when the ecosystem reaches its mature state. After every disturbance, the ecological succession will culminate in the climax community. For example, ecological succession triggered by fires in Yellowstone Park culminates in pine forests. Pioneer species are the first species to colonize an area after a disturbance occurs. They reproduce quickly and survive in harsh conditions. For example, lichens.</span>
