Question

River dolphins are morphologically distinct from other dolphins and are primarily restricted to freshwater ecosystems in Asia and South America.

a. True
b. False

Answer 1

River dolphins are indeed unique to freshwater ecosystems in Asia and South America, and their similar body shapes to fish represent an analogous trait due to living in similar environments.

Step-by-step explanation:

The statement that river dolphins are morphologically distinct from other dolphins and are primarily restricted to freshwater ecosystems in Asia and South America is true. When addressing comparisons between dolphins and fish, it's important to note that dolphins and fish have similar body shapes, which is more likely an analogous trait rather than a homologous one.

Dolphins are mammals and fish are not, indicating that they have different evolutionary paths, but they have developed similar body shapes due to adaptation to similar environments, which in this case is an aquatic environment conducive for swimming.

Answer 2

a. True

Step-by-step explanation:

• The river dolphin is a group of aquatic animals that is specially adapted to the fresh water and are relatively smaller compared to the other dolphins.

• They have evolved to survive in shallow waters and strong-river currents. These dolphins are not very widely disturbed and are found in certain deltas and rivers.