A vast majority of people have an opinion that people should not harm animals because they have the same sentiments just like human beings, whilst others have a contradictory opinion that animals satisfy diverse needs of humans, and they need to be tested in laboratories and are also used for eating purposes. I would argue that animals are necessary to use for mankind.
The opinion not to threaten animals is valid for several reasons. Animals are part of our eco-system, and without their presence out ecological system can collapse because every species on this earth meant for several reasons, and they make our ecological chain; the absence of any one of them can cause the biggest threat to our environment. For instance, snakes eat different insects if they are extinct due to the various attempts of human beings then the population of insects gets an increase, which is not good.
Nevertheless, I believe that animals fulfill our various needs which are needed to be fulfilled. Firstly, the meat of some animals is vital for human beings; they can get protein from animals’ meat. For example, the meat of cow and sheep give strength to the human population. Moreover, scientists are worked on various medicines which are needed to be tested priority on animals; it is very crucial so that no humans would be harmed by the side effects of those medicines. In this way, they can save the lives of many precious people around the world.
For the reasons mentioned above, although animals are also a beautiful creature and it should not be done upon them but it is necessary and they are for the purpose to serve mankind. 
A vast majority of  
people
 have an opinion that  
people
 should not harm  
animals
  because
 they have the same sentiments  
just
 like  
human
 beings, whilst others have a contradictory opinion that  
animals
 satisfy diverse needs of  
humans
, and they need to be  
tested
 in laboratories and are  
also
  used
 for eating purposes. I would argue that  
animals
 are necessary to  
use
 for mankind.
The opinion not to threaten  
animals
 is valid for several reasons.  
Animals
 are part of our eco-system, and without their presence out ecological system can collapse  
because
 every species on this earth meant for several reasons, and they  
make
 our ecological chain; the absence of any one of them can cause the biggest threat to our environment.  
For instance
, snakes eat  
different
 insects if they are extinct due to the various attempts of  
human
 beings then the population of insects  
gets
 an increase, which is not  
good
. 
Nevertheless
, I believe that  
animals
 fulfill our various needs which  
are needed
 to  
be fulfilled
.  
Firstly
, the meat of  
some
  animals
 is vital for  
human
 beings; they can  
get
 protein from  
animals’
 meat.  
For example
, the meat of cow and sheep give strength to the  
human
 population.  
Moreover
, scientists  
are worked
 on various medicines which  
are needed
 to be  
tested
 priority on  
animals
; it is  
very
 crucial  
so
 that no  
humans
 would  
be harmed
 by the side effects of those medicines. In this way, they can save the  
lives
 of  
many
 precious  
people
 around the world.
For the reasons mentioned above, although  
animals
 are  
also
 a  
beautiful
  creature and
 it should not  
be done
 upon them  
but
 it is  
necessary and
 they are for the purpose to serve mankind.