1/2, anything divided by 1 is always going to stay the same, also as anything divided by 0.
Photosynthesis is the process by which plants take in sun light and carbon dioxide and produce glucose while respiration is when humans take in oxygen and glucose and produce carbon dioxide
Hope this helps
Arthropoda and molluscs have open circulatory systems - meaning haemolymph (Their equivalent to blood) directly bathes the tissue, and isn't enclosed in blood vessels, as seen in a closed blood system, as in humans for example.
