Scientific investigations are looking into the topic or question asked, scientfic knowledge is the knowing or understanding of the topic or question asked.
The appropriate answer is c. It reduces pollution from runoff. Drip irrigation supplies water directly to the roots of the plants. This reduces loss of water from infiltration and evaporation. Water with nutrients is supplied directly to the roots of plants and so this reduces the chance of excess water infiltrating the soil and contaminating the ground water with pollutants.
The answer is higher.
You should know that the London dispersion force is the weakest intermolercular attractive force while the hydrogen bonds form a high attractive intermolecular force, so you have to expect that in molecules forming hydrogen bonds the molecules will be more attached to each other than in similar-sized molecules that interact by London dispersion forces only, which takes you to conclude that the melting point of the molecules forming hydrogen bonds will be higher.
Low friction between you/the ski vs the snow.
if you think about it its kinda like you and a slip and slide...water helps decrease friction so you slide (snow does the same for the skiing) but without it you just flop and don't go anywhere (very easily anyway).
The correct answer here is A - An atom with a positive charge has more
protons than electrons. In the other instances the atom would have a
negative charge.