Species are disappearing almost a thousand times faster than they are forming. what is the main cause? reproductive isolation continental drift natural disasters human impact

Human impact

Explanation:

It is normal to the species to disappear, but it is not normal to do so as fast as they do this times.  

The human, and its consumerism that exerts, are the causes of the force extintion of the species. Consumerism is the cause of greater amount of greenhouse gases, erosion due the exesive felling of trees, and for that, lower water retention, and so the water cycle changes.  If the hand of the human changes something of the natural cycle, changes everything

the eggs of the insects should be the first thing collected at the scene.

false

genetic variation can be caused by mutation (which can create entirely new alleles in a population), random mating, random fertilization, and recombination between homologous chromosomes during meiosis (which reshuffles alleles within an organism's offspring).