Answer:
D)They both contain carbon, but only nucleic acids contain phosphorous.
Answer:
C
Explanation:
Protozoa have been classified into three trophic categories: the photoautotrophs which harness the sun's radiant energy in the process of photosynthesis; the photoheterotrophs, which although phototrophic in energy requirements, are unable to use carbon dioxide for cell synthesis and must have organic carbon compounds
Answer:B.
It was used to prove that smoking causes health problems.
Explanation:
