The two main points from Darwin's theory of evolution is that 1) most, if not all living organisms evolved from  one or just a few common ancestors and that subsequent specialization of further generations then led to new species. Furthermore, he said that 2) the process how this was done was by natural selection where the organisms which were most adapted to their environment were successfully 'remembered in the gene pool'. 
        
             
        
        
        
The correct answers are as follows:
1. A.
There are basically two types of succession, they are primary and secondary succession. Primary succession refers to the type of succession that occurs in new and bare areas where the soil present is unable  to sustain the growth of plants. An example of primary succession area is an area with sand dunes that is freshly formed. Primary succession usually occur over a long period of time. Secondary succession is a type of succession that occur on a land which was disturbed by  hazardous events such as fire outbreak, flood, etc. Secondary succession occurs much faster than the primary succession.
2. D
There are two types of factors that affect any particular ecosystem, these are abiotic and biotic factors. The abiotic factors refers to non living factors such as temperature, relative humidity, rainfall, etc. while the biotic factors refer to the living factors. Looking at the options given above, one will see that only option D has living factor, which is predators. All other options have abiotic factors.
        
             
        
        
        
Answer:
meditation
Explanation:
The relaxation response technique is a stress reduction technique that combines elements of relaxation and meditation. This was a technique made by Dr. Herbert Benson as a treatment for a wide range of stress-related disorders. Parts of the technique include sitting comfortably with eyes closed while doing a series of breathing exercises. Which are also methods used in meditation.
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Answer:
The electron transport chain uses the high-energy electrons from glycolysis and the Krebs cycle to convert ADP to ATP.
Explanation:
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