The one with the the limestone thingy is faster because the friction is loss
my educational guess
What ^ he/she said! Hope you have a good day :)
This process is called Facilitated diffusion. because the protein channels must help the substance get into the cell based on fitting. It's important to regulating what comes in and goes out.
In commensalism, one organism benefits from the relationship while the other species involved neither benefits nor is harmed. The benefits for one organism can be in a variety of forms, including food, shelter, transportation and seed dispersal.
Answer: The Answer is A.
Explanation: All you had to do is copy and paste the question.