It is generally believed  some people that conducting  medical research to figure out safety factors 
Change preposition
 by 
was
 Wrong verb form
is
a 
cruel and non-sense, Change the article
apply
while
 others Linking Words
believed
 it is important for medical purposes. Wrong verb form
believe
Although
 Linking Words
this
 trend has some drawbacks, personally I believe that the advantages outweigh the disadvantages.
It is common thing Linking Words
using
 Wrong verb form
use
animals
 to do experiments ,especially for studying purposes. Use synonyms
To begin
 with, Linking Words
mice
 are used to test a new medicine and find out the side effects of that drug,Use synonyms
,
Change the punctuation
apply
Linking Words
however
 it is so inhumane because torturing and even  the Add a comma
however,
mice
 became death. Use synonyms
Moreover
, if Linking Words
this
 kind of experiment frequently occurs, as a Linking Words
,
result population of Remove the comma
apply
mice
 could be reduced in the future. Use synonyms
Thus
, we need a variety of Linking Words
animals
 to do that test, Use synonyms
instead
 Linking Words
rely
 on Wrong verb form
of relying
mice
. 
Use synonyms
On the other hand
, there are several benefits of Linking Words
this
 activity Linking Words
such
 as reducing the potential hazard for Linking Words
humans
 Use synonyms
as well as
 developing medical inventions, Linking Words
as a consequence
 can be used to save human life. Linking Words
Firstly
,  using Linking Words
animals
  will reduce the possible risks that can Use synonyms
be emerged
 from experiments and tests. Wrong verb form
emerge
Besides
, since Linking Words
this
 activity was prohibited in the early 1990s, Linking Words
so 
it will not break the government's rules. Rephrase
apply
For instance
, Linking Words
mice
 are usually  used to figure out novel drugs to save human Use synonyms
life
 during the coronavirus outbreak. Fix the agreement mistake
lives
Thus
, utilizing Linking Words
animals
 is safer rather than directly testing on Use synonyms
humans
. Use synonyms
Secondly
, It is Linking Words
also
 cheaper Linking Words
if
 use Change preposition
to
animals
 compared to Use synonyms
humans
. Use synonyms
As a result
, the expenditure to do  research will affect the medical cost of drugs affordably as well. To illustrate, one research using Linking Words
mice
 only takes  US$ 1000 compared to Use synonyms
humans
 could be  US$ 120,000.
Use synonyms
To conclude
, some people think that using some  Linking Words
animals
 is  rude and cruel, even though using Use synonyms
animals
 has some demerits Use synonyms
such
 as being inhumane and unacceptable by some Linking Words
Use synonyms
animals defender
, I personally believe the advantages could save human life and assist novel inventions for medical studies.Fix the agreement mistake
animal defenders