Question

Sharks, whales, and dolphins share similar features such as body shape and the position of fins. However, sharks have gills for breathing, while whales and dolphins have lungs. These differences indicate that the organisms share a common ancestor for .

Answer 1

Sharks, whales, and dolphins share similar features such as body shape and the position of fins. However, sharks have gills for breathing, while whales and dolphins have lungs. Sharks and dolphins are similar in construction because they need their parts to complete many of same functions.

For example:

The dorsal fins that are found in both shark and dolphin are due to convergent evolution and they are actually not from common ancestor.

Answer 2

Answer: b and c

Explanation: