Question

when multiple transitional fossils are found in many rock layers, they provide evidence of -
a seasonal variation in the diet of a species
b gradual change of a species over time
c dna functioning as the genetic material of organisms
d an unchanging environment

Explanation:

Fossils in different rock layers show how species change over time. Transitional fossils specifically show intermediate forms between ancestral and descendant species. This is related to the concept of evolution, which is the gradual change of a species over time. Option A (seasonal variation in diet) is a short - term change. Option C (DNA as genetic material) is a molecular aspect not directly shown by fossil layering. Option D (unchanging environment) is incorrect as the presence of multiple fossil layers implies environmental and species changes over time.

Answer:

B. gradual change of a species over time