<span>Pangaea was the last of the great continents. Wegener hypothesized that all of the continents were one continent based on physical evidence that he collected. The shapes of the shores, matching mountain ranges and fossils/plants found on different continents. What Wegener did not have was the mechanism. Hess in 1963 discovered what is now called Mid-Ocean ridges. What accurs here is faults in the crust allow magma to move to the surface. The build up of magma, rift valeys leads to divergence of the plates moving apart. The continents began to pull apart and move away from each other. But as contnients move away from each other essentially they are also moving towards each other from another reference point. Now new have oceanic crust/plates moving towards continental plates leading to convergence. Look up the Wilson Cycle. It is like talking about what comes first, the chicken or the egg and if you do not look at the very beginning of earth it does not fully make sense.</span>
Answer:
15%
Together, adenine and thymine compose 70% of the segment. This means that 30% of the section is composed of guanine-cytosine pairs. Since these two bases will be equal in quantity, 15% of the DNA section will be cytosine bases.
Answer:
They are a type of extremophile organism. The name comes from the Greek word for "salt-loving". While most halophiles are classified into the Archaea domain, there are also bacterial halophiles and some eukaryota, such as the alga Dunaliella salina or fungus Wallemia ichthyophaga.
Answer:
The option which is not responsible for the cause of urban migration is the search for suitable land for agriculture. Hence the answer is option D.
Explanation:
The land for agricultural use is available in rural areas and it is not available in urban areas. The land in urban areas is suitable for infrastructure and buildings and houses. Hence there is no land available for the agriculture purpose.
Also, we know that there is much pollution in urban areas which is not suitable for the growth of crops. In rural areas the atmosphere and all the condition is favorable for the growth of crops. Hence, we can see that it is not a cause for migration to urban areas.