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.
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Answer: Students have the right to refuse to participate in this study.
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1. Traditional - most traditional type of economy, and throughout the world many economies function this way. The areas with these economies are usually rural areas, or third world areas that are heavily dependent on farming. In this system, a surplus is rare, each member’s role is specific, and societies are closer knit along with more satisfied, although there is a lack of things such as technology and medicine that is more advanced.
2. Command - A big part of a command economy is controlled by power that is centralized such as the central government. A command system is the core of a communist economic system. The government is involved in most things big and small, along with owning most of the industries. most command economic systems tend to focus on things that are more valuable such as oil rather than jobs and other goods.
3. Market - economy is the free market have firms and households that act in their own self interest rather than in the interest of others. In a command economy the government keeps the profits while in a free market economy the forms and households keep their own profits. in a pure market economy there is no government intervention however none of this exists in the world. in this type of economy the central government in the market are completely separate so the government does not become too powerful.
4. Mixed - when different types of economies are combined this is called a mixed economy. this is usually a cross between a market economy and a command economy. in this type of economy the market is more or less free of government ownership except the government does own a few key things like transportation industries. sometimes in these economy as the government does regulate private businesses this is to use the best of both worlds to incorporate policies that are both socialist and capitalist to create a fair balance of both. most countries throughout the world have a mixed economic system.
