<span>The ischemic penumbra can maintain metabolic demand with marginal blood flow from collateral circulation for a maximum of 50% before increasing in size. A penumbra is the area where the flow of blood at about 25 - 50% can maintain normal metabolic demands for 6 - 8 hours only. When it continues to increase, the human cells will die and other neurological activity will be suspended causing the person to die slowly.</span>
Provide sperm to fertilize the eggs in the female reproductive system.
In psychology, the term nature refers to traits that
are a result of heredity.
<span>Plato (428–347 BC)
believed that people’s ability to think, feel and interact are innate and
natural. That is, the person already had a set of its characteristics by the
moment he or she was born through his or her genes passed on from his parents.
He believed that people already have the certain tendency to react to a certain
stimulus even before he was taught by his environment.</span>
Answer:
Explanation:
Natural selection is based on Darwin’s observation that individuals most likely to survive and reproduce are those with traits best suited to their current environment.
