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Is life possible on Venus?
What is needed for life to exist at Venus?
What is needed for human life to breath?
What does the atmosphere need to be like?
Answer 1:

The answer to this question is really dependent on how you define life. When we first started (if you don't take God created human being) with life evolution, we thought life could be only possible with light, water and air (oxygen). Later on more life forms were discovered and they didn't need light or oxygen (anaerobic organisms). But water is still required for the life forms we know. So far as we know about Venus, it seems too hot to have any of the life we know. However, we can't rule out the possibility that there could be other life forms exist and they might be completely different from what we know. Therefore, there could be life on Venus but it's may just not be the same as we think.

I'm sure you know a lot of Venus already. I found this website:
life on Venus
It looks like a good one and you can get a lot more information from there.

We need O2 to survive and that what we breathe. In fact, the air is composed of 78% Nitrogen and 21% oxygen. We take in both Nitrogen and oxygen but we won't use any of the nitrogen. The oxygen we breathe in will be exchanged with carbon dioxide inside our body and be exhaled out with the nitrogen. Therefore, for human being to live, we definitely need to have oxygen in the atmosphere. Also, as you may know, we need the ozone to protect us from being burned by the high energy from the sun.

Answer 2:

Some scientists think that there is some reason to believe Venus may have been the best haven for life in the early solar system. But having 900 degree Fahrenheit surface temperatures and an atmosphere permeated by carbon dioxide, chlorine and sulfuric acid clouds today, Venus seems inhospitable to "our kind of life." Then we can say that life as we conceive it, can not exist in Venus.

The assertion that microbial life may exist in the Venusian atmosphere is based on the assumption that microbial life originated in an early Venusian ocean, or was brought in by meteorites from Earth or Mars. Life then adapted to the atmospheric niche when Venus lost its oceans.

To bolster the case for life on Venus, one needs to first look at Earths own atmosphere, there are microbes in the Earths atmosphere that independently grow and reproduce. Actually, the conditions in the Venusian atmosphere would be much better [for microbes] than for Earths atmosphere.On Venus, clouds are at 31 miles (50 kilometers) altitude. Thats perfect for a "biozone" a comfortable home for microbes that is relatively benign. Below that height things are too hot, and any higher theres too much ultraviolet radiation and zapping from cosmic rays. These conditions make "our kind of life" impossible.

In order for human life to breath, Nitrogen (79% of air), and Oxygen (20% of air) are needed in the atmosphere. The pressure and the temperature are also important for "our kind of life". The average temperature of the atmosphere at the surface of the earth is 57.2 Fahrenheit degrees, and the average atmospheric pressure at sea level is about 14.7 pounds per square inch. The atmospheric pressure is a direct result of the weight of the air.

Answer 3:

Life as we know it is not possible on Venus. In order for Venus to be habitable, the temperature would need to be such that liquid water could exist, and then water would need to be present. The temperature on Venus is about 900 degrees C, and even if the temperature were lowered, there still would be no water because there is no steam left (water gets broken up by ultraviolet light).
Humans need not only reasonable temperatures and water but we also need an oxygen atmosphere, which Venus also lacks. Having atmospheric pressure less than 90 Earth Atmospheres is also likely to be important (in more ways than merely the extreme pressure creating the extreme temperature).

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