In which situation would it be least likely for a scientist to revise her experimental methods

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

Which situation is an example of not doing work? lifting a couch throwing a baseball running up stairs carrying a box

Which is an example of a vestigial structure? a. tail of a monkey b. fin of a fish c. flower of a plant d. tailbone of a human