In some cases of head injuries, the cerebrum may be affected. This type of injury could cause a loss of <u>voluntary</u> <u>movement</u> and impaired <u>speech</u>
In order for an ecosystem<span> to be self-</span>sustaining, it must have<span> a continuous flow of energy and be able to recycle materials</span>
An epoch is longer than an era.
The answer is the fourth one :)
Biology is basically the type of science that studies life and living organisms.
