Problem 4 - Biology: The Dynamic Science

Question

The animal group that exhibits external fertilization is the: a. amphibians. b. birds. c. sharks. d. reptiles. e. mammals.

Step-by-Step Solution

Answer

The correct answer is a. amphibians.

Step 1: Understanding the concepts

First it's important to understand the concepts of internal and external fertilization. Internal fertilization occurs when sperm and an egg combine inside of an animal's body. External fertilization, on the other hand, is the process of fertilization that takes place outside of the body. Many aquatic and some terrestrial species are known to use external fertilization.

Step 2: Identifying the animals' method

Next, by using general knowledge about the different animal groups, mark down which animals most likely use external fertilization. Birds, sharks, reptiles and mammals are known for internal fertilization. This leaves amphibians, which are known to use external fertilization in many species, like frogs and toads. Thus, the correct answer should be amphibians.