¿mecanismos de regulación de los seres vivos? una tarea para mañana en la mañana

Which medullary index indicates a human hair? a. 0.653 b. 0.733 c. 0.516 d. 0.256

What is true of all organisms in the kingdoms protista, plantae, fungi, and animalia? a. they are multi-celled. b. they are photosynthetic. c. they have cells that contain membrane-bound organelles. d. they contain cells that lack membrane-bound organelles.

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