I assume you meant calcium carbonate, CaCO3, since "cac03" makes no sense.
It's chalk. You can eat it if you want (it's not actually poisonous), but it's going to be hard to chew, and in significant quantities it's not going to be good for you.
On average, humans unintentionally consume about 140,000 insect fragments each year.
No, humans do not consume DNA as part of their diet.
No, humans cannot safely consume cooked grass as it is not a suitable food source for our digestive system.
Yes, humans can safely consume carob as it is a nutritious and non-toxic food that is often used as a substitute for chocolate.
No, it is not safe for humans to consume rabbit droppings as they may contain harmful bacteria and parasites that can cause illness.
Sumac berries are not poisonous to humans and are safe to consume.
368 liters a day
They are not the most delicious. Humans can eat all sorts of bugs if they chose to.
No, almonds are not toxic to humans. They are a nutritious and safe food to consume in moderation.
Humans but non humans consume as well however these are usually represente by humans.
Grassland
368 liters a day