It uses nephridium as the expiratory organ for flat worms
Answer:
Cell theory states that B) All living things are made up of cells and A) cells come from other living cells.
Abiotic because <span>its pretty clear that a virus is not a living organism and its not dead since it never was alive so its <span>abiotic.</span></span>
Ocean acidification is a process that can occur in ocean due to the uptake of extra atmospheric 
<u>Explanation:</u>
Ocean acidification is happening since abundance carbon dioxide 
in the environment is being caught up in the outside of the sea at an expanding rate. Regularly, sea water is less acidic than freshwater. As such the sea assimilates increasingly more carbon dioxide from the climate, it turns out to be progressively acidic.
This process of brings about more hydrogen particles, which builds the causticity of the sea. So this Ocean acidification is a procedure that can happen in the sea because of the take-up of extra biometric.
