Peanuts are legumes and don’t really fall under the same category of allergy as tree nuts. There’s a good chance that you can eat peanuts just fine, unless you have observed an allergic reaction to them of course https://acaai.org/allergies/allergic-conditions/food/tree-nut/

Maybe not necessarily the dairy cow herself, but she needs to be pregnant about once per year so she doesn’t stop producing milk. That means that the calves inevitably need to be slaughtered (as well as older dairy cows) or else the herd would keep growing year after year.

Nah, you don’t necessarily need lab grown or fake meat to have a healthy delicious varied vegan diet. Legumes like chickpeas, different kinds of beans and lentils as well as soy products can provide enough protein and variety if you put some effort into your cooking. You do need B12 supplements on a vegan diet though, as well as some specific nuts and seeds to cover omega 3. So those can be a problem if there’s not a lot of variety in the stores near you and you can’t order it online for whatever reason.