List two general reasons why scientists are likely to collaborate

Two scientists may try to collaborate under Few circumstances :-

Every scientist have their II level of knowledge and creativity on combining two it might result in a better outcome Mistakes of one can be analysed and covered by the other thereby increasing the chances of getting good results.

A rather greatest spectrum of knowledge  would be present as the knowledge of two scientists would always be more than one Which is also true in the case of expertise in more than one subject can be there.  

the answer would most likely be c, because if it's a comical piece of information, it may likely not be true, if it's a site that allows anybody to edit the content, it could mean a five year old is typing the info, and if it's a tv show produced by a celeb, it may have a biased opinion.

a.   mass number from atomic number