They share genetic traits. The current organisms were once members of the same species as them. It is believed they just evolved.
What is extinct organisms?
A species is considered extinct when there are no longer any surviving examples of it anywhere on the planet. This can happen with both plants and animals. An organic byproduct of evolution is this. However, sometimes extinctions happen far more fast than usual. The primary contemporary causes of extinction include habitat destruction and loss, mostly due to deforestation, overexploitation via overhunting and overfishing, invasive species, climate change, and nitrogen pollution.
When there are no longer any living members of a certain animal or plant species anywhere in the globe, the species has become extinct. This is an organic byproduct of evolution.
Thus, They share genetic traits. The current organisms were once members of the same species as them.
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