Paired blocks of embryonic mesoderm that eventually develop into bones and skeletal muscles are known as
1 a. phylogenetic pathways
O b. gradients
O c. master cells
O d. front-to-back axes
comitor

answer; i believe that the correct answer is (lung);

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.