What is the difference between bicuspid valve and tricuspid valve?

Is there any species that went extinct in recent years due to natural causes (not caused by human interaction). if so, what caused it?

Pls in your opinion, what are the limiting factors that might affect the growth or diversity of our ecosystem? respond to this question in claim, evidence, reasoning format. 1. make your claim (i are the limiting factors that might affect the growth or diversity of our 2. follow the claim with 3 pieces of evidence. evidence may be taken from the reading, the videos, previous lessons, or googled answers. site sources, too. 3. use reasoning to explain why you chose your evidence.

What are the ingredients of oobleck?