Fish belonging to species S in the deep sea have skins that are extremely black (ultra-black skin). This helps them not only to avoid predators but also sneakily attack their prey. However, having this extra layer of black pigment results in lower collagen on their skin, making their skin more fragile. Which one of the following is the CORRECT logical inference based on the information in the above passage?

The correct option is: "Having ultra-black skin has both advantages and disadvantages to species S".

Let us break down the logical inference step-by-step based strictly on the provided passage:

1. Identifying the Advantages:
The passage states that having ultra-black skin "helps them not only to avoid predators but also sneakily attack their prey." This clearly outlines two distinct survival advantages for species S: predator avoidance and improved hunting capability.

2. Identifying the Disadvantages:
The passage also states that "having this extra layer of black pigment results in lower collagen on their skin, making their skin more fragile." This highlights a clear physiological disadvantage: increased skin fragility due to lower collagen levels.

3. Synthesizing the Logical Inference:
Since the ultra-black skin provides both positive benefits (avoiding predators, attacking prey) and negative trade-offs (fragile skin due to lower collagen), the correct logical conclusion is that having ultra-black skin has both advantages and disadvantages to species S.