Evolution is a theory because it is an explanation that is supported by extensive observations, experimentation and reasoning.
Option B
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Explanation:</u></h3>
There can be many reasons that evolution is a theory.
1. A scheme or system of ideas or statements that are kept as an explanation or account of a group of facts or phenomena.
2. It is a hypothesis that is confirmed by observation or experiment and is accepted as accounting for the known facts.
3. Evolution is the change in the characteristics of a species over several generations and relies on the process of natural selection.
There are tonnes of evidences of evolution on the planet Earth.The most common example is the evolution of man. From australopithecus afarensis to homo sapiens today.
Answer:
The type of sampling used in Jankowski's study of gangs is Option D. Stratified sampling.
Explanation:
With stratified sampling, the researcher will partition the population into different groups, usually based on some characteristic that is common to that group. In this case, it was the different kinds of gang membership. Then, the researcher will take a sample of people within each specific group using another sampling method like simple random sampling for instance. The groups that are used in stratified sampling are called strata. Another example would be a national survey that is divided into strata of the different major ethnic groups that comprise the national population.
Answer: The great increase in production of food grains (such as rice and wheat) due to the introduction of high-yielding varieties, to the use of pesticides, and to better management techniques.
Explanation: Therefore, the reason why it was called green revolution is because The Green Revolution was a period when the productivity of global agriculture increased drastically as a result of new advances. These new farming techniques and advances in agricultural technology were utilized by farmers all over the world, and when combined, intensified the results of the Green Revolution.