What are three ways your body defends itself against pathogens

1 reason: Certain white blood cells called lymphocytes are responsible for producing the antibodies which destroy specific pathogens by detecting antigens (foreign chemicals released by the pathogen).

2 reason: Pathogens can produce harmful chemicals called toxins, and white blood cells produce antitoxins to destroy these.

3 reason: White blood cells are key in protecting against pathogens. They ingest the harmful microorganisms (they surround them and take them up - a bit like eating them, but you must use the word ingest).

I found these on internet and a little bit of my knowledge but I hope this helps :)

The atmosphere wasn’t strong enough to contain more oxygen when compared earths atmosphere today, the exosphere was full of rips and couldn’t contain enough oxygen to provide for land creatures, although aquatic earthlings could continue i exist in this environment