Why are people hesitant to accept the idea of extinction?

Astudent is looking through a microscope at some cells of an onion root tip. many of these cells are undergoing division since the root tip grows quickly and requires more cells. which cell most recently underwent metaphase? w x y z

According to cell theory; which structures carry out the basic function of living things? a. atoms b. organs c. cells b. nuclei

Which star has the highest apparent magnitude?