Question

a large asteroid impact occurs, kicking up dust that blocks the sun and prevents plants from photosynthesizing. what would most likely happen as a result of the asteroid impact? more earthquakes would occur across the planet. some plants would evolve to use dust as a source of food. many plants would perform photosynthesis without sunlight. many species would eventually die off because they lack a food source.

Explanation:

Plants rely on sunlight for photosynthesis to produce food. Without sunlight due to dust - blocking after asteroid impact, plants cannot photosynthesize. Many species that depend on plants for food would lack a food source and eventually die off. Earthquakes are not directly related to this dust - blocking effect. Plants cannot evolve that quickly to use dust as food, and they cannot perform photosynthesis without sunlight.

Answer:

Many species would eventually die off because they lack a food source.