Where do humans get nitrogen from?

How do you identify the anode on a power source such as a battery? how do you identify the cathode? how are terms anion and cation?

Which statement best describes the function of enzymes?

What will most likely happen in the absence of a cell membrane? a) photosynthesis will not take place. b) the cell will not store food, water, nutrients, and waste. c) energy will not be released during cellular respiration. d) substances will pass in and out of the cell in an uncontrolled manner.