Question

What is common to whale, seal and shark ?

• A. Homoeiothermy
• B. Seasonal migration
• C. Thick subcutaneous fat
• D. Convergent evolution

Answer 1

The Correct Option is D

To determine what is common to whales, seals, and sharks, we must examine the shared characteristics and evolutionary traits among these animals.

1. Homoeiothermy: Homoeiothermy, or being warm-blooded, is a trait found in mammals like whales and seals but not in sharks, which are cold-blooded fish. Therefore, this option does not apply to all three.
2. Seasonal migration: While certain species of whales and seals do undergo seasonal migrations, not all species of sharks migrate seasonally. This option is not a common trait among all three.
3. Thick subcutaneous fat: Both whales and seals have thick layers of subcutaneous fat (blubber) for insulation, but sharks do not possess this feature. Thus, this is not common to all three.
4. Convergent evolution: Convergent evolution refers to the process where organisms that are not closely related independently evolve similar traits as a result of having to adapt to similar environments or ecological niches. Whales (mammals), seals (mammals), and sharks (fish) all show adaptations to aquatic environments despite being from different evolutionary backgrounds. This trait is common to all three.

Hence, the correct answer is Convergent evolution, as it explains how these diverse species have similarly adapted to life in water through evolution, despite their different lineages.

This knowledge of convergent evolution helps in understanding evolutionary biology and ecological roles across different species.