Answer:
Maintains dynamic equilibrium is correct answer.
Explanation:
The volume of the rectangular pyramid is 28 cubic feet.
<h3>
How to find the volume of the pyramid?</h3>
The volume of a pyramid of base B and height H is given by:

Here we know that the height is H = 7ft, and the base is a rectangle of 4ft by 3ft, so the area of the base is:

Then the volume of the pyramid is:

If you want to learn more about volumes:
brainly.com/question/1972490
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The Marsh Crab uses cordgrass as a source of food.
The Periwinkle Snail eats the algae on the cordgrass and it uses it as a place to hide from predators.
The Seaside Sparrow users cordgrass to make nests