State the basic requirement of sexual reproduction. write the importance of such reproduction in nature

The process of sexual reproduction includes fusion of female and male gametes coming from both the parents. In the process of sexual reproduction, a new individual is produced due to the combination of two haploid gametes, one from the female parent, and the other coming from the male parent.  

The importance of sexual reproduction:  

1. The joining of DNA from two distinct individuals results in the increase in the genetic variation in the offspring.  

2. This further results in diversity in the population that assists in natural selection.  

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when you breathe in, or inhale, your diaphragm contracts (tightens) and moves downward. this increases the space in your chest cavity, into which your lungs expand. the intercostal muscles between your ribs also enlarge the chest cavity. they contract to pull your rib cage both upward and outward when you inhale.