Although most of the world's forests are shrinking, biologists are especially concerned about tropical forest loss because.

A. they contain such high biodiversity. B.tropical trees are the biggest trees in the world. C. they contain very few wood resources D. the soil is very fertile and can be used for farming

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Tropical trees are the biggest trees in the world

The correct answer to the question is A. they contain such high biodiversity.

To arrive at this answer, you need to understand the key concerns of biologists when it comes to tropical forest loss. Here's how you can get to the correct answer:

Step 1: Understand the question.
The question is asking why biologists are particularly concerned about tropical forest loss compared to other types of forest loss.

Step 2: Analyze the options.
A. they contain such high biodiversity.
B. tropical trees are the biggest trees in the world.
C. they contain very few wood resources.
D. the soil is very fertile and can be used for farming.

Step 3: Eliminate incorrect options.
Option B can be eliminated because the size of trees is not a primary concern for biologists. Option C can also be eliminated since tropical forests are known to have diverse wood resources. Option D is also not a main concern because the value of fertile soil does not specifically relate to the concerns of biologists in terms of forest loss.

Step 4: Choose the correct option.
After eliminating the incorrect options, we are left with option A, which states that biologists are concerned about tropical forest loss due to their high biodiversity. This aligns with the known fact that tropical forests are incredibly biodiverse ecosystems, housing an immense variety of plant and animal species.

Therefore, the correct answer is A. they contain such high biodiversity.