D would be the correct statement
1. The stem should be cut at least three to four inches above the ground surface level.
2. The stem should be fixed tightly into the glass capillary.
3. The connection should be made air-tight, using paraffin wax.
4. Initial and final mercury levels should be carefully noted.
5. The experiment should be preferably performed in the morning time.
Biomolecules include large macromolecules (or polyanions) such as proteins, carbohydrates, lipids, and nucleic acids, as well as small molecules such as primary metabolites, secondary metabolites, and natural products. A more general name for this class of material is biological materials.
The balanced equation of photosynthesis is: <span>6CO2 + 6H2O + light energy = C6H12O6 + 6O2.
The correct answer is that "it is equal to the total mass of carbon dioxide and water used" as the substrates (CO2 and H2O) are just merely converted to the products (C6H12O6 and O2) with no mass being consumed or used as fuel for the reaction. In this reaction, energy is well conserved.</span>