In vertebrates such as a chicken, a mouse, of a python, variation in the number of vertebrae in the spine is determined by Hox genes. Which MOST LIKELY way that Hox genes account for this variations?

A) As Vertebrates evolved, mutations in Hox genes led to new vertebral organization during embryological development

B) As vertebrates evolved, mutations in Hox genes directly resulted in new proteins that determined vertebrae

C)Long before vertebrates evolved, a wide variety of Hox genes developed and many codes for vertebral structures

D) Environmental factors, which differ among vertebrate groups, activate specific Hox genes that code for specific structures

Read the following scenario to answer the following question. over the past 60 years, many amphibian species have experienced significant population declines, and some species have become extinct. scientists suspected that local human activities such as the destruction of wetlands, regional pollution, and deforestation were the main reasons for these losses. however, research over the past 20 years reveals significant amphibian population declines in protected areas of the world, such as nature preserves and parks. these global declines suggest widespread problems including increased ultraviolet radiation, acid rain, and disease. in switzerland, for example, 14 of the 20 native amphibian species are threatened with extinction. when most populations of a wide-ranging amphibian species are lost and the few remaining populations are widely separated, we expect to see that a. the founder effect becomes increasingly important b. microevolution no longer occurs c. gene flow between populations is reduced d. artificial selection becomes a greater factor in microevolution

Name the part of the the brain labeled "e".

Did you know that a single bee would have to go to over 2 million flowers to make a single pound of honey?