Multiple Choice
Which of the following are the only extant animals that descended directly from dinosaurs?
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1. Introduction to Biology
Introduction to Taxonomy
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Which of the following is a characteristic of sponges (Phylum Porifera)?
A
They exhibit cephalization.
B
They possess a complete digestive tract.
C
They have bilateral symmetry.
D
They lack true tissues and organs.
Verified step by step guidance1
Understand the question: The problem is asking for a characteristic of sponges, which belong to the Phylum Porifera. This requires knowledge of their biological features and classification.
Recall the defining traits of sponges: Sponges are simple multicellular organisms that lack true tissues and organs. They are considered basal animals in the evolutionary tree.
Eliminate incorrect options: Sponges do not exhibit cephalization (the development of a head region), as they lack a nervous system. They also do not possess a complete digestive tract, as their digestion occurs intracellularly. Additionally, sponges do not have bilateral symmetry; they are asymmetrical or exhibit radial symmetry.
Focus on the correct characteristic: Sponges are unique in that they lack true tissues and organs, which distinguishes them from other animal groups. Their bodies are composed of specialized cells that perform different functions but are not organized into tissues.
Conclude the reasoning: Based on the biological traits of sponges, the correct answer is that they lack true tissues and organs. This is a fundamental characteristic of the Phylum Porifera.
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