5 Questions
What is the estimated number of living animal species on Earth as of 2022?
7.77 million
Which scientific study is concerned with the study of animal behaviors?
Ethology
What is the most successful subphylum under the deuterostomes?
Vertebrates
Which group do most living animal species belong to?
Infrakingdom Bilateria
During embryonic development, animals grow from a hollow sphere of cells called:
Blastula
Test your knowledge on the diverse characteristics and classifications of animals, including their cellular structure, movement, and reproductive processes. Learn fascinating facts about the millions of living animal species in the world.
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