Which scientist thought he proved that plants obtain nutrients from water rather than soil?
✓ van Helmont
COMPLETE
Which scientist demonstrated that the green parts of plants absorb carbon dioxide and release oxygen
only in sunlight?
DONE
Which scientist showed that plants use red and blue light in photosynthesis?
DONE

the sugar-phosphate backbone forms the structural framework of nucleic acids, including dna and rna. this backbone is composed of alternating sugar and phosphate groups, and defines directionality of the molecule.

hydrogen is a compound or a single element and a element is a pure substence that cannot be separated into simpler subtances

clorine is a compound its a chemical substance that forms when two or more different elements combine

so both hydrogen and clorine are compounds