Final answer:
Tropical species are more at risk because they have a narrow performance curve with a small thermal safety margin.
Step-by-step explanation:
The statement that best describes which type of species is more at risk due to climate change is:
A.) Tropical species, because they have a narrow performance curve with a small thermal safety margin
Tropical species are more at risk because they have a narrow performance curve with a small thermal safety margin. This means that they are highly specialized to function within a specific temperature range, and even a small increase in temperature could have detrimental effects on their survival and reproduction.
In contrast, temperature species (B.) have a broad performance curve with a large thermal safety margin, allowing them to tolerate a wider range of temperatures. This makes them less vulnerable to the temperature changes associated with climate change.