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Answer:
3.8 billion years
Explanation:
The ocean formed billions of years ago.
Over vast periods of time, our primitive oceans formed. Water remained a gas until the Earth cooled below 212 degrees Fahrenheit . At this time, about 3.8 billion years ago, the water condensed into rain which filled the basins that are now our oceans.
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Hornblende and other amphiboles have double chain silicate structures.
Tetrahedron (SiO4)^4- is the fundamental building block of all the silicate minerals. Silicate minerals comprising chains are known as inosilicates. In single chains, the ratio of silicon to oxygen is 1: 3, while it is 4: 11 in the case of double chains.
The double-chain silicates take place when tetrahedral produce a double chain by sharing two or three oxygen atoms each.
Answer:
Geographic isolation causes a reduction in speciation, eventually resulting in dissimilarities in a once-similar population of organisms. Gene Flow genetic mutation.
Explanation:
What was once a continuous population, is now divided into two or more smaller populations due to Geographic isolation of organisms.
Answer:
G and H
Explanation:
Producers are plants at the bottom of the food chain
