Answer:
Different groups of bacteria help in the cycling of nitrogen , carbon and phosphorus by chemical fixing or releasing in environment.
Explanation:The ecosystem contains flow of energy and cycling of minerals.
In the cycling of minerals, the micro-organisms help in fixing atmospheric nutrients e.g., nitrogen fixation by some bacteria and release the nutrients to the environment by decomposition of organic matters.
Different groups of bacteria help in the cycling of nitrogen , carbon and phosphorus by chemical fixing or releasing in environment.
molten material
magnetic stripes
Explanation:
The evidence that supports the proposition that sea floor spreading occurs from the options are the magnetic stripes and molten materials.
Harry Hess proposed the concept of sea floor spreading which further led to the development of the theory of plate tectonics.
Some of the evidences used are :
- Magnetic stripes in the rocks of the oceanic crust around spreading centers.
- They were discovered using magnetic survey of the ocean floor.
- Bands of magnetic minerals were seen to be oriented in particular direction and forms different patterns in the rock.
- Also, along spreading centers, molten materials rich in basalt abounds.
- This is because when sea floor begins to move apart, magma upwells from deep within the asthenosphere to replace them.
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Answer:
The correct answer is option 3.
Explanation:
Chronic bronchitis normally occurs with respiratory infection after the age of 35 where is emphysema occurs after the age of 50. There is usually a persistent,
productive cough of copious mucopurulent sputum where is in emphysema there is no cough or scant if any high breathing sound.
Thus, the correct answer is option 3.
Answer:
skin cells and muscles divide
Explanation: common sense cse we grow
