I don't really completely understand what you're saying here but yes, we need plants to live, especially trees but there's a massive difference between growing plants for food and randomly chopping down trees for no reason. Plant agriculture (as a whole, because there is problems) is much less harmful than animal agriculture, and what I mean by that is that you're not always "killing" plants to get your food, plus the food used to feed livestock animals could practically feed everyone in the world, so if you're saying that's a better option than eating plants, I think you're wrong as that actually "kills" more plants. I don't know what you mean by the grass part?
It matters to me personally if they have a brain or not, as killing something with a brain and nervous system is morally wrong to me. So now you can kill things based on their importance? If that was the case I would have been killed long ago. I'm not denying that plants are important and I never did?
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It's not necessary to kill animals for us to live?