Answer: (B) a phenomenon most scientists agree that is caused by fossil fuels burned by human beings.
Explanation:
Global warming is a phenomena of the environment. In this the earth atmosphere is affected by the harmful greenhouse gases. The majority of the greenhouse gases are produced by the virtue of burning of the fossil fuels. The burning of the fossil fuel liberates gases which are toxic. These gases have a diatomic structure, which enable them to absorb the heat energy from the sunlight. Thus these gases make the atmosphere hot. As a result of this the atmosphere of earth is becoming warm globally and glacier region is depleting.
Some life cycles are the same like complete and incomplete metamorphosis.
Griffith experiment
Griffith used two types of bacteria in his experiment
1. R-type: it was non-virulent and cause no disease in mice
2. S-type: It was virulent and cause disease in mice which lead to death.
However when heat killed S-type was applied no disease was occurred in mice. Then he mixed heat killed S-type and live R-type and injected it into mice. He was expecting that no disease will be caused in mice.
Results
However, mice was died.
Conclusion
He was confused from this experiment. But later it was confirmed by other scientists that DNA from heat killed S-type was shifted to R-type. the progeny which formed from this transfer of DNA were virulent and cause the death of mice.
significance
It was concluded from this experiment that DNA is a hereditary material which transfer characters from parents to offspring.
Answer:
<u>D.</u><u> </u><u>variety</u><u> </u><u>of </u><u>mature</u><u> </u><u>plants</u><u> </u><u>and </u><u>trees</u>
Explanation:
because climax, ecology, the final stage of biotic succession attainable by a plant community in an area under the environmental conditions present at a particular time.
