Identifying the Profession:
The passage clearly identifies Charles Darwin as a biologist, noted for his contributions to the theory of evolution and natural selection.
Aligning with Darwin’s Theories:
The statement that all life forms developed slowly over time from lower life forms is a direct reflection of Darwin’s theory of evolution through natural selection, as described in the passage.
Identifying the Theory:
Darwin’s description of the survival and reproduction of the fittest individuals is the essence of his theory of natural selection and survival of the fittest, as explicitly mentioned in the passage.
Evaluating the Reception:
The passage specifically notes that many religious opponents condemned On the Origin of Species, indicating a significant pushback against the ideas presented in it.
Write any four problems faced by the animals that thrive in forests and oceans: 
Verbal to Non-Verbal:
A stain is an unwanted mark of discolouration on a fabric caused due to contact with another substance which cannot be removed by the normal washing process. Stains can be grouped on the basis of their origin, e.g. tea, coffee and fruits come from vegetable source. Stains from shoe polish, tar, oil paints come under grease stains. Animal stains comprise of stains formed by milk, blood and eggs, whereas marks on your clothes after sitting on an iron bench are those of rust and come under mineral stains. Then there are stains that are formed due to dye, into perspiration which can be categorised under miscellaneous stains. Read the given passage and complete the table. Suggest a suitable title. 

Arun’s present age in years is 40% of Barun’s. In another few years, Arun’s age will be half of Barun’s. By what percentage will Barun’s age increase during this period?