Atoms of which pair of elements will form metallic bonds in a compound? A. I and F
B. Ag and Ca
C. Na and Br
D. Be and CI

Which of these statements is true about autotrophs, but not heterotrophs? a. they use sugar and oxygen to make carbon dioxide and water. b. they use chlorophyll and oxygen to make carbon dioxide and water. c. they use sunlight, water, and carbon dioxide to make sugars. d. they use sunlight, water, and oxygen to make chlorophyll.