Animal
Animal
Characteristics:
- Animals are multicellular eukaryotes whose cells are bound together by collagen.pable of movement.
- Mobility is one of the primary characteristics of the animal kingdom1.
Diversity and Abundance:
- Over 1.5 million living animal species have been described.
- Approximately 1.05 million species are insects, over 85,000 are mollusks, and around 65,000 are vertebrates.
- Scientists estimate that there may be as many as 7.77 million animal species on Earth1.
Body Length and Ecological Interactions:
- Animal body lengths range from tiny microorganisms (8.5 μm or 0.00033 in) to massive creatures (up to 33.6 m or 110 ft).
- Animals form intricate food webs and have complex interactions with each other and their environments1.
Evolution and Fossil Record:
- Animals first appeared in the fossil record during the late Cryogenian period.
- The Cambrian explosion (around 539 million years ago) marked the diversification of modern animal phyla.
- Most animal classes emerged during the Ordovician radiation (485.4
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