Question

sand dunes protect beaches against erosion and flooding due to storms. which human activity would have the most negative impact on dune grasses and the coast? driving vehicles along the beach building houses near the beach walking on the dunes of the beach allowing kids to play on the beach

Explanation:

Driving vehicles along the beach can cause significant physical damage to dune grasses through compaction of the sand and direct trampling. This disrupts the root - systems and can lead to erosion of the dunes and negatively impact the coast. Building houses, walking, and allowing kids to play can also have impacts but are generally less severe in terms of the scale of damage to dune grasses and the coast compared to vehicle traffic.

Answer:

driving vehicles along the beach