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Which of the following types of species are known as the extinct species?
[2010, 2011 (T-1)]
  • a)
    Species whose population levels are normal
  • b)
    Whose population has declined
  • c)
    Species with small population
  • d)
    Species which are not found
Correct answer is option 'D'. Can you explain this answer?
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Which of the following types of species are known as the extinct speci...
Extinct Species
The correct answer is option D: Species which are not found. Extinct species refer to those species that no longer exist or are not found in the wild or in their natural habitats. These species have completely disappeared from the Earth. Extinction can occur for various reasons, such as habitat destruction, overhunting, pollution, climate change, or natural disasters.

Explanation:
To provide a detailed solution, let's briefly look at the other options and why they are not correct:
- Option A: Species whose population levels are normal
- This option refers to species with stable or sustainable population levels. It does not imply that the species is extinct.
- Option B: Species whose population has declined
- While a declining population may indicate a risk of extinction, it does not necessarily mean that the species is extinct. Extinction occurs when a species no longer exists.
- Option C: Species with a small population
- A small population size may make a species vulnerable to extinction, but it does not guarantee that the species is already extinct.
Therefore, the correct answer is option D: Species which are not found. Extinct species are those that have vanished from the Earth, either due to natural causes or human activities, and are no longer found in their natural habitats.
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Read the source given below and answer the questions by choosing the most appropriate option:Countries with higher income are more developed than others with less income. This is based on the understanding that more income means more of all things that human beings need. Whatever people like, and should have, they will be able to get with greater income. So, the greater income itself is considered to be one important goal. Now, what is the income of a country? Intuitively, the income of the country is the income of all the residents of the country. This gives us the total income of the country. However, for comparison between countries, total income is not such a useful measure. Since, countries have different populations, comparing total income will not tell us what an average person is likely to earn. However, for comparison between countries, total income is not such a useful measure. Since, countries have different populations, comparing total income will not tell us what an average person is likely to earn. Are people in one country better off than others in a different country? Hence, we compare the average income which is the total income of the country divided by its total population. The average income is also called per capita income.In World Development Reports, brought out by the World Bank, this criterion is used in classifying countries. Countries with a per capita income of US$ 49,300 per annum and above in 2019, are called high income or rich countries and those with a per capita income of US$ 2500 or less are called lowincome countries. India comes in the category of low middle-income countries because its per capita income in 2019 was just US$ 6700 per annum. The rich countries, excluding countries of the Middle East and certain other small countries, are generally called developed countries.Which of the following is the correct formula to calculate the average income of the country?

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Which of the following types of species are known as the extinct species?[2010, 2011 (T-1)]a)Species whose population levels are normalb)Whose population has declinedc)Species with small populationd)Species which are not foundCorrect answer is option 'D'. Can you explain this answer?
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