Don't let Jaws ruin your perception of sharks! Through their evolution, sharks have shaped our oceans into the rich habitats we know today. As apex predators (animals that are at the top of the food chain), sharks play an important role in the ecosystem and help keep the ocean and fish populations healthy. Discover our favourite facts about these ocean creatures.
I heard this on The Infinite Monkey Cage yesterday and had to look it up and share.
This is a dubious claim, and a hard one to prove conclusively either way. The first trees are likely older than 350 MYA, eg Archaeopteris macilenta, which lived during the second half of the Devonian around 400 MYA. As for the first sharks, modern sharks evolved in the Jurassic, around 200 MYA. However:
Some sources extend the term “shark” as an informal category including extinct members of Chondrichthyes (cartilaginous fish) with a shark-like morphology, such as hybodonts. Shark-like chondrichthyans such as Cladoselache and Doliodus first appeared in the Devonian Period (419–359 Ma), though some fossilized chondrichthyan-like scales are as old as the Late Ordovician (458–444 Ma)
Also, prior to vascular trees evolving, there were other tree-like plants and fungi that existed on land, and also trees have evolved independently possibly hundreds of times because they are not a monophyletic clade like sharks, but are instead represented in clades across all vascular plants
This is a dubious claim, and a hard one to prove conclusively either way. The first trees are likely older than 350 MYA, eg Archaeopteris macilenta, which lived during the second half of the Devonian around 400 MYA. As for the first sharks, modern sharks evolved in the Jurassic, around 200 MYA. However:
Also, prior to vascular trees evolving, there were other tree-like plants and fungi that existed on land, and also trees have evolved independently possibly hundreds of times because they are not a monophyletic clade like sharks, but are instead represented in clades across all vascular plants
The best way to get the right answer on the Internet, is not to ask a question, but to post the wrong answer 😄