What component of earth’s atmosphere exists entirely as a result of photosynthesis? a)oxygen gas b)water vapor c)nitrogen gas d)carbon dioxide gas

Which of the following represents a negatively charged ion? of t 7

Membrane vesicles containing an internal sodium chloride (nacl) concentration of 0.14 m are placed into separate beakers each containing a different solution. the first beaker contains 0.14 m sucrose, while the second beaker contains 0.14 m calcium chloride (cacl2). the temperature is 25°c. what is the solute potential inside the vesicles, expressed in units of mpa?

Which structure in the cardiovascular system connect arteries to veins?