Answer:
- Gases from Earth's surface form the atmosphere
- Earth's surface cools
- Photosynthetic organisms absorb atmospheric carbon dioxide and release oxygen
- The composition of Earth's atmosphere changes.
- Organisms with aerobic metabolism evolve
Explanation:
According to the <u>chemosynthetic hypothesis of the origin of life</u>, gases such as methane, hydrogen, water vapor, etc. that emanate from the earth's interior formed the atmosphere of the primitive earth.
The earth's surface was characterized by volcanic activities and as it cools down, the water vapor in the atmosphere began to condense and form puddles of water on the surface of the earth. A chemical soup was later formed from the dissolution of the atmospheric gases catalyzed by heat, lightning discharge, and UV rays.
From the chemical soup, the first organism with heterotrophic metabolism evolved, and as the evolution continued and resources became limited, autotrophic organisms emerged and are able to utilize carbon dioxide and water to photosynthesize and release oxygen as a by-product.
As oxygen gradually gets to the atmosphere, the composition of the earth's atmosphere changed and organisms with aerobic metabolism evolved.
Answer:
In order to be classified in the same species, a group of organisms must be able to A. interbreed and produce fertile offspring
Explanation:
A group of organisms living in a common area is not enough to be classified in the same species. Eating similiar foods and possessing a similar diet either. Biologocial concepts distinguishes two species based on the degree of genetic exchange between their gene pools. In order to be classified in the same species, a group of organisms must be able to <em>interbreed and produce fertile offspring. </em>Two very closely related species that have diverged from each other quite recently shared a common ancestor recently in evolutionary time. They will persist only as distinct biological species if they have reproductive isolation from one another.
Answer:
Since it has no charge it would have 20 electrons .
