The number one reason organisms become endangered and/or go extinct is because of a. poaching/illegal hunting

b. invasive species

c. pollution

d. habitat loss

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

The science for classifying and naming organisms is known as

In an experiment examining the effects tai chi on arthritis pain, callahan (2010) selected a large sample of individuals with doctor-diagnosed arthritis. half of the participants immediately began a tai chi course and the other half (the control group) waited 8 weeks before beginning. at the end of 8 weeks, the individuals who had experienced tai chi had less arthritis pain that those who had not participated in the course.