The first reason was that his theory of continental drift was just too weak for most geologists to accept. Even though he believed the supercontinent that broke up into different continents moved, he did not have a clear explanation to how the continents moved. The other reason is that some of his explanation clashed with ideas that were widely accepted in the science communities. He used similar fossils from different continents to back up his theory of continental drift. However, at that time, many scientists that had observed similarities in fossils in places like South America and Africa believed there were similar fossils in different continents because of a land bridge that were formed by two continents.
Many science communities believe that land bridges allowed migration of many different species and even people to one place to another by large bodies of water frozen by low temperature known as ice age.
In the development of a cancer cell, the formation of new blood vessels is called Angiogenesis, option B. When tumors are present in the body, circulation and the distribution of nutrients in the body is altered; thus, resulting in different kinds of disorders associated with cancer. With the presence of cancer, these tumors need more nutrients to spread and grow, which results in the formation of more blood vessels.
Answer:
A malaria outbreak causing allele frequencies to change is an example of <u><em>natural selection.</em></u>
Explanation:
Natural selection is a type of selection in which those organisms are favoured to live and reproduce which are better adapted to live in an environment. Due to natural selection, the allele frequencies of a population will tend to change with the passage of time.
When the outbreak of malaria occurs, those organisms which do not catch malaria are able to survive and pass on their characteristics to their offsprings. the other organisms die and do not reproduce. This will cause changes in the allele frequencies.
immediately before passing into the large intestine, the food mass must pass though the <span>ileocecal valve.
</span>This muscle valve is part of the gastrointestinal system and separates the small intestine and the large intestine. The valve <span>opens when a bolus of food passes from the small intestine into the large intestine (your inner sewer pipe) during peristalsis.</span>
