Answer:
less than 1%
Explanation:
The approximate percentage of the geologic time that humans have existed on the Earth since its origin is less than 1%.
The earth is about 4.6 billion years and much of its history has been without the present of human activities.
- Hominis were the first human to appear on the surface of the earth.
- This was in the Miocene epoch which was about 6 million years ago.
- Compared to the age of the earth, this time lapse is very small and not up to 1%.
- Life first appeared on earth about 3.5billion years.
- Since then evolution has taken its due course to give what we have today.
Explanation:
The production and release of thyroid hormones, thyroxine and triiodothyronine, is controlled by a feedback loop system that involves the hypothalamus in the brain and the pituitary and thyroid glands. ... This system allows the body to maintain a constant level of thyroid hormones in the body.
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Answer:
Totipotential.
Explanation:
There are different cell potencies. A <u>totipotent</u> cell is a stem cell that can divide itself and <u>differentiate in any cell </u>that the organism needs. That is to say, endodermal cells, ectodermal cells, mesodermal cells, or extra-embryonic tissues. As cells differentiate themselves, they can gradually lose their potential. The cell's category that follows is pluripotent cells. These are stem cells that can only differentiate into ectoderm cells, endoderm cells, or mesoderm cells. Then we have multipotent cells, which differentiate into tissue cells. The next category is oligopotent cells. They give a limited number of specific cells, and lastly unipotent cells, only differentiate in one type of cell.
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<h2>Respiratory Acidosis</h2>
Explanation:
- <em><u>The need for a stronger than normal stimulus in order to trigger an action potential</u></em>
- The reasons for impaired respiration include aviation route obstacle, discouragement of the respiratory focus in the<em> brain stem, lung disease, and medication overdose</em>
- The <em>hypoventilation </em>brings about raised c<em>arbon dioxide levels in the blood, the H levels increment, and the pH estimation of the blood decreases</em>
- Respiratory acidosis is a health related crisis in which diminishes the <em>blood's pH</em> (a condition by and large called acidosis) and the ventilation increases the <em>concentration of carbon dioxide in the blood</em>
