This is a type of chemical reaction that involves the loss of water from the reacting molecules. in biological systems, it usually refers to the production of larger, biomolecules or polymers from smaller monomers.

This type of reaction is called dehydration reaction or dehydration synthesis.

The example is the synthesis of disaccharides. When two monosaccharides, such as glucose and fructose, join together (to form sucrose) they form glycosidic linkage via dehydration reaction, the water is released.  

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the correct answer is: b. pantala flavescens, because these organisms would have a high level of genetic variation due to sexual reproduction.  

because involves two organisms (parents) whose genetic material combines, sexual reproduction leads to genetic variation in new generations of offspring. the offspring is an unique organism, with new genome, more protected with the higher ability to adapted. this process is fundamental to evolution.