Tyrone mixes some chemicals together. He notices that the mixture gives off heat and is hot to touch. What type of reaction is this? A. Physical
B. Chemical
C. Polar Bear
D. Solution

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.