Indeed you are spot on. Withouth the constant bio,photonic, acoustic, and other signals coming directly from out Mother Earth, all flura and fauna would not exists. This has known many yeaqrs ago by the acient shamans, aboriginal people, sages, medcine me, and adepts of antiguity. They practice certain ritual on astrological dates in the hopes of bringing porsperity for the their people as well and heal and strengthen the immune system of the Earth. Certain geographical lotacation were chose where it was believe there was much power and energy there(like the Earth Chakra point, one on eath continent) Sadly this knowloedge has been largelty forgotten.
This is the same on all planets whether life present or not. These are called the "shuman waves."
Earth resonated as certain frquencies dependent upon it's weight, lilt, orbit, density, and other factors.
The Earth itself, by contrast, has roughly only several dozen million individual species that have been properly identified, with many more left undiscovered to be sure.
I do not believe however that we at all necessary in this procesd. If pushed I would say we are the cancer of this Earth with out current technological advancement. However there is no need to worry. As mentioned, the Earth is conscious and will purge itself our species(and likrly many more) if it truly feels a great thread to it'd homrstsis. It will then spend some much needed time to help itself and another species will repeat this process via evolution.