When the isotonic saline solution described in part A is connected to an unknown solution via a semipermeable membrane, the unknown solution level drops. Based on this information, what can be said about these two solutions?

The new solution has a higher concentration than the isotonic saline solution

Explanation:

Here, we want to deduce what has happened in the question.

We are told that the level of the isotonic saline solution dropped because it was connected an unknown solution using a semipermeable membrane.

Since the level of the solution dropped, then it must have occurred that there has been the loss of some of the molecules of the solution.

What has occurred is the process of Osmosis

Osmosis simply involves a movement through a semipermeable membrane of solvent molecules due to the fact that the previous solution is of lower concentration than the present one.

So what we can see here is that there has been a movement due to osmosis as a result of the fact that the new solution has a higher concentration than the former one

The answer is B. American alligator

Explanation:

Energy Pyramid:

A type of ecological pyramid that describes the energy contained in each trophic level or stage of the food chain. This pyramid is basically a representation of the flow of energy from producers to the top consumer in the food chain. There is a successive decrease in each trophic levels from the bottom to the top. This means that the producers produce the most amount of energy for their daily needs e.g. 1000 kcal. This 1000 kcal will be reduced to only 1 kcal energy by the time it reaches the tertiary consumer or top consumer.

Trophic Levels:

According to the energy pyramid in the question, trophic levels and organisms they signify are as follows (from bottom to top):

The tertiary consumers secure the top of the food chain and they prey on the primary and secondary consumers. In this case, the american alligator is the top consumer as it feeds on reptiles, birds, fish and mammals.