Red blood cells will shrink because it is a hypertonic solution.
Explanation:
The sodium chloride concentration is higher: 1.5% > 0.9%, so it is a hypertonic solution. If the cells are immersed in a hypertonic medium - which is, a medium with a sodium chloride concentration higher than the concentration inside the cells - the water cells will move out from the cell. In consequence, the cells will lose water and they will shrink.
Trees and birds have a commensalism relationship. The birds benefit from having a place to build their nests, while the trees are unharmed and not impacted by the bird’s presence.
