Answer:
b. resistance to extinction
Explanation:
This is because, when there is a schedule of reinforcement over a given case scenario, it offers partway to resistance to extinction.
<em>For example, in plant, when a particular plant is threatened by weeds trying to prevent it from growing, the plant would of intermittent reinforcement by trying to grow in any available space rather than allowing the its extinction by the weed.</em>
The organisms in the Cretaceous period and Permian Period are now extinct.
The emergence and demise of specific living forms are represented by time periods on the geologic time scale that span hundreds of millions of years. A mass extinction is a period of geologic time when a large number of plant and animal species go extinct, sometimes within a few thousand to a few million years.
Life has recovered after each of the five significant mass extinctions that have taken place during the past 500 million years. Because it led to the extinction of the dinosaurs, the mass extinction at the end of the Cretaceous Period is the most well-known. However, the Permian Period's end saw the most extreme one in terms of the number of species destroyed.
Know more about Cretaceous Period here
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The correct answer is letter A.
Explanation: South Africa has the second largest economy in Africa. In the sectors of economy the main are manufacturing, wholesale and retail trade, transport, mining, agriculture, financial services and of course tourism.
Kenya has one of the fastest growing economies in Africa, their growth is by encouraging trade, small business, developing sectors of energy and agriculture. Agriculture is the main reason of economic growth.
During acculturation, some changes in the meal patterns of Mexican Americans might most likely include changes in the healthy diet include an increase in consumption of milk, vegetables, and fruits. The classic Mexican-American diet has a variety of foods and dishes that represent a blend of pre-Columbian, native Indian, American culture. Mexicans traditionally have pattern of four or five meals each day but because of immigration of the United States, it changed to the three meal pattern.
