Which of the following animals is correctly matched with its type of skeleton?
a. Fly—endoskeleton
b. Earthworm—exoskeleton
c. Lobster—exoskeleton
d. Bee—hydrostatic skeleton

Verified step by step guidance

Step 1: Understand the three main types of skeletons: endoskeleton, exoskeleton, and hydrostatic skeleton. An endoskeleton is an internal support structure found in vertebrates like humans. An exoskeleton is an external protective covering found in arthropods like insects and crustaceans. A hydrostatic skeleton relies on fluid pressure within the body to provide support, commonly found in soft-bodied animals like earthworms.

Step 2: Analyze the options provided in the question. Each option pairs an animal with a type of skeleton. You need to determine whether the pairing is correct based on the animal's biology.

Step 3: Evaluate option (a): A fly is an insect, and insects have an exoskeleton made of chitin, not an endoskeleton. Therefore, this pairing is incorrect.

Step 4: Evaluate option (b): An earthworm is a soft-bodied animal that uses a hydrostatic skeleton for movement and support. It does not have an exoskeleton. Therefore, this pairing is incorrect.

Step 5: Evaluate option (c): A lobster is a crustacean, and crustaceans have an exoskeleton made of chitin. This pairing is correct. Option (d) can also be evaluated: A bee is an insect, and insects have an exoskeleton, not a hydrostatic skeleton. Therefore, this pairing is incorrect.

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Key Concepts

Here are the essential concepts you must grasp in order to answer the question correctly.

Types of Skeletons

Animals possess different types of skeletons that provide structure and support. The main types include endoskeletons (internal skeletons, like those in vertebrates), exoskeletons (external skeletons, like those in arthropods), and hydrostatic skeletons (fluid-filled cavities providing support, common in soft-bodied animals). Understanding these types is crucial for identifying the correct match between animals and their skeletal structures.

Exoskeleton

An exoskeleton is a rigid external covering that provides protection and support to an organism. It is commonly found in arthropods, such as insects and crustaceans, and is made of chitin. This structure allows for mobility while safeguarding the organism from environmental hazards and predation.

Hydrostatic Skeleton

A hydrostatic skeleton consists of a fluid-filled cavity surrounded by muscles, allowing for movement and support without a hard structure. This type of skeleton is typical in soft-bodied animals like earthworms and jellyfish, enabling them to change shape and move through their environment effectively.