1. Which of the following groupings contains only representative elements? Al, Mg, Li
Ni, Fe, Zn
Cu, Co, Cd
Hg, Cr, Ag

Which of the following represents the ester functional group? a. -coo- b. -cho c. -cooh d. c=o

If you try to move a piano and are unable to move it, did you perform any work in the scientific sense of the word? yes? or no? this question is worth 20 points! let it be correct!

2. what two items do autotrophs take from the environment to produce their food? 3. what are the two items that are released during transpiration from leaves? 4. what are the two membranes of the system? a. what are the two stages of photosynthesis? what are the two parts of photosynthesis?