The products for photosynthesis are sugar (C6H12O6) + oxygen (6O2)
<span>The scientific study of the distribution and
abundance of organisms and the interactions that determine distribution
and abundance. This definition encompasses not only the plants and
animals that Haeckel recognized but microscopic organisms such as Bacteria, Archaea and protozoa, as well.</span>
The correct answer is option B
Biological systems can be defined as the complex system in which the function of a component is dependent on the functioning of the other components. By knowing the function of each component one can get an insight into the structure and organization of the living system. The different components of the biological systems are interconnected and they function accordingly.
Usually in experiments, you want multiples of the same thing so the data is accurate and consistent and not just some fluke and to make sure you didn't have some major error you missed.