Hi, it's an interesting read where you looked up several sources. I've a few comments:

However, is it possible to have animals that can survive without oxygen? This kind of question remains.

Why only animals? That's just one kingdom within a specific domain. Furthermore, there are organisms that thrive in the absence of oxygen. They are called anaerobic organisms. Although you could argue that you are referring to some Martian form or organism with characteristics similar to terrestrial animals.

Life cannot live without water.
...
I don't think life ever existed on Mars. I don't think life will be possible in the future. Only the earth has the right environment for life to exist. Life may exist on other planets like Earth.

Well, we need to add a disclaimer: "life as we know it". Perhaps life can emerge with and from a different set of conditions than on Earth. This is something we cannot disprove.

On the other hand. I have some suggestions.

1. Check your HTML/markdown code, because your links are broken. You've added an extra https string or something.
2. As for the texts of the articles you have used, don't insert them like that. It is better if you use the quote function. You can do it using the > operator or the HTML blockquote tag. This is important because those texts are not yours. You must cite them properly.
3. I see you use inline links, that's great. However, don't wrap a whole paragraph with a link. It looks too long. Instead, wrap a few words that reference that source.