What is the purpose of an indicator? to cause a change in ph to identify acids only in a solution to identify bases only in a solution to identify the ph of a solution

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 material is commonly used as a culture medium for living cells

The law of thermodynamics states that energy can't be created or destroyed. to natural sources of energy on earth are the