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kirill115
1 day ago
8

Why is the horseshoe crab an example of a living fossil?

Biology
2 answers:
inysia [1.6K]1 day ago
8 0
The horseshoe crab exemplifies a living fossil due to the presence of fossilized extinct ancestors, while the species remains extant today. The horseshoe crab has withstood the test of time, having survived mass extinction events and still exists. Further Explanation: Horseshoe crabs are deemed living fossils since they have remained unchanged for around 445 million years. They do not belong to the crab lineage and are not closely related to lobsters or crabs; rather, they have a closer affinity with spiders and arachnids. There are currently four known species of horseshoe crab, with Limulus polyphemus being found in North America along the Atlantic and Gulf coasts from Maine down to Mexico. Remarkably, their appearance has scarcely changed compared to ancient relatives after all this time. They feature a robust, tank-like body structure consisting of: A spike tail known as the telson (used for digging and is quite delicate), a major shell called the prosoma (the largest section), and a rear shell termed the opisthosoma (the horseshoe crab's abdomen, forming the midsection of the shell).
Rainbow [1.7K]1 day ago
3 0
A. Fossils of long-extinct ancestors of horseshoe crabs exist, and the species continues to thrive today. Explanation: Options C and D pertain more to the fossilization process. It is classified as a living fossil as its ancestors have been found in the fossil record while the species persists today.
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