Question 2
Which special property of water lets it supply a medium for the biochemical reactions inside cells?
The right answer is the one marked above.
Water is an excellent solvent. That single property does three jobs: it supplies the medium for biochemical reactions in cells, it makes water the main component of all extracellular fluids, and it lets animals excrete waste.
The other three options are wrong on the facts. Water's specific heat capacity is high, and water is denser than ice, which is why ice floats.