Which of the following statement about natural selection are correct ?
Tends to increases the characters that enhance survival and reproduction
(ii) Causes adaptation
(iii) Acts on an organism phenotype
(iv) Was considered as mechanism of evolution by Darwin

Options

A. (i) , (ii), (iii) and (iv)
B. (i) and (ii)
C. (iii) and (iv)
D. (i) , (iii) and (iv)

Answer

To determine which statements about natural selection are correct, let's analyze each statement step by step.

### Step-by-Step Solution:

1. **Statement (i): Tends to increase the characters that enhance survival and reproduction.**
- Natural selection favors traits that improve an organism's chances of survival and reproduction. Organisms with advantageous traits are more likely to survive and pass on these traits to their offspring. Therefore, this statement is **correct**.

2. **Statement (ii): Causes adaptation.**
- Adaptation refers to the process by which a species becomes better suited to its environment. Natural selection drives this process by favoring individuals with traits that provide a survival advantage. Hence, this statement is also **correct**.

3. **Statement (iii): Acts on an organism's phenotype.**
- Natural selection operates on the observable traits (phenotype) of organisms rather than their genetic makeup (genotype). Variations in phenotype can affect an organism's ability to survive and reproduce. Therefore, this statement is **correct** as well.

4. **Statement (iv): Was considered as a mechanism of evolution by Darwin.**
- Charles Darwin proposed natural selection as the primary mechanism of evolution. He explained how natural selection leads to the gradual change in species over time. Thus, this statement is **correct**.

### Conclusion:
All four statements about natural selection are correct.