12 Questions
What distinguishes bilaterians from sponges?
Presence of well-defined tissues
What is a characteristic feature of most vertebrates?
Possession of a vertebral column
When did animals first evolve according to the text?
600 million years ago
What differentiates cnidarians from sponges?
Presence of well-defined tissues
What is a defining characteristic of protostomes and deuterostomes?
Development from two germ layers
Which phylum contains jellyfish and sea anemones according to the text?
Cnidarians
What type of symmetry do sponges typically display?
Irregular form with no plane of symmetry
Why is cephalization considered an adaptation for locomotion?
To concentrate nervous system tissue and sense organs for quick processing of sensory information
What distinguishes animals showing bilateral symmetry?
They have a distinct head and tail with a single plane of symmetry
How does radial symmetry benefit animals like jellyfish and sea anemones?
It permits them to wave their food-gathering tentacles in all directions at once
What is the significance of having sensory organs near the brain due to cephalization?
It aids in processing sensory information quickly for behavioral responses
Why do crabs and alligators possess complex organs specialized for various functions?
For improved digestion and gas exchange
Test your knowledge on the evolutionary relationships and key characteristics of animal species. Questions cover phylogeny, early branches of the animal tree, bilaterians, vertebrates, and the timeline of animal evolution.
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