I In an experiment to determine what
type of acid is the most corrosive,
which of the following must be a
controlled variable?
A. The acids used
B. The material the acid is poured on
C. The size of the hole created by the acid
D. All of the above

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.