The couple bar is cut into three pieces of unequal length all three pieces of copper would have what

Which of the following is a period in the paleozoic era? devonian cambrian permian all of the above

What is it called when part of a cell membrane closes around a molecule to allow the molecule to enter the cell? a. passive transport b.diffusion c. endocytosis d. exocytosisc. endocytosis

Which of the following is an eon in the time scale? phanerozoic proterozoic archean all of the above