The atmosphere of Venus is known to be very thick probably because it contains mostly carbon dioxide. This can make it easier to trap the heat that comes from the sun. The atmosphere is also known to be much thicker than the earth’s atmosphere. Other things that can contribute to the type of atmosphere that this planet has is the sulfuric acid that can be found all over the atmosphere.
There is also water vapor that can be found in Venus but they are considerably less as compared to what you will find here on earth. It is evident that there are so many differences between venus and earth that would explain why Venus cannot sustain life.