The nucleus manages the daily operations of the cell. Organelles need instructions from the nucleus. Without a nucleus, the cell cannot get what it needs to survive and thrive. A cell without DNA lacks the capacity to do much of anything other than its one given task.
The stomach <span>walls have a lining that contains epithelial cells that have a protective layer of mucus and bicarbonate. The mucous is pretty much the same stuff which lines our throat and nose.</span>
Yes humans are part of the environment.
Yes, they can benefit an organism. That is why evolution works
Answer:
I am not going to straight out give you the answer, because I believe you can figure the answer out yourself. Ask yourself is the fossil living (or once living) or not living? If the fossil <em>is </em>living or once lived, that would make it biotic. If the fossil is not alive, that would make it abiotic.
