Otters are from keystone species from the subfamily of Lutrinae. Lutrinae is a branch of Weasel. The actions of the humans that can ensure that the sea otter will continue their function in the environment would be to establish in the Atlantic ocean a sea otter wildlife refuge and also pass laws to regulate the hunting of such species.
<u><em>Answer:</em></u>
<u><em>242.9421 L</em></u>
Explanation:
Red blood cells carry oxygen; white blood cells fight disease.
It's D because it's found in the <span>cell's plasma membranes (at high concertration levels)
Hope this helps!! :-)</span>
