Which scientist sought to disprove needham’s experimental method by boiling his broth in a sealed container first, as he believed the broth was contaminated by microorganisms before it was sealed?

The answer is Louis Pasteur.  The scientist which sought to disprove Needham’s experimental method by boiling his broth in a sealed container first, as he believed the broth was contaminated by microorganisms before it was sealed.  His hypothesis is that "Microbes do not arise spontaneously from non-living matter, but are produced only by other, living microbes."  

The answer to your question is vagina

Because the carnivores keep the herbivore population in check