What is one function of steroids?
a. waterproofing leaves and feathers b. insulating and protecting bones and organs see. c. serving as chemical messengers d. providing energy storage

if the type of the food available changes, then the frequency of beak types will change, because birds with beaks more suited to the available food will be more successful over time.

b is dominant over the allele for the white fur.

weathering - colorado river carves land in arizona to form the grand canyon. cracks form in a sandstone wall surrounding a house. a marble statue near the science museum is changing color due to rainfall

erosion - after a rainstorm, soil and rock piees litter the roadways. the sand dunes in the sahara desert are changing shape.

here's your answer.