When did animal life first appear? What did these early animals look like? What environmental changes allowed for the evolution and radiation of animal life? The early fossil record is full of extinct life forms that might be animals. Unfortunately, scientists have had a hard time reaching consensus about what these fossils are, partially because they are so […]
It is common knowledge that many animals can regenerate lost body parts. Some lizards can regrow lost tails; earthworms can be cut in two, with each piece regenerating its missing half. Surprisingly, no clear pattern seems to separate the species that can regenerate lost tissues from those that cannot. Why can some flatworms regrow a […]
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