Elements or compounds that can only be separated or combined to make substances with new properties by means of a chemical reaction.

answer; hypnagogic sensations)

answer by yourhope:

answer is

human impact on the environment can be seen in the deterioration of the !

: )

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.