A 25-year-old medical student spent a summer volunteering in the sub-Saharan region of Africa. There he noted a high incidence of people reporting difficulty with night vision due to a lack of vitamin A in their diet. Vitamin A is a precursor for the synthesis of

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#Question id: 8901

#9. Diversity of Life Forms

The origin of the craniates occurred at roughly the same time as the

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#Question id: 8902

#9. Diversity of Life Forms

What do craniates have that earlier chordates did not have?

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#Question id: 8904

#9. Diversity of Life Forms

Terry takes the body of the snakelike organism and slices it open along its dorsal side. If it is a hagfish, what should Terry see?

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#Question id: 8905

#9. Diversity of Life Forms

Terry saved some of the tooth-like objects within the hagfishʹs round mouth to analyze their composition in his mentorʹs biochemistry research lab. Terry will find that they are composed of the same protein found in reptilian

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#Question id: 8906

#9. Diversity of Life Forms

What do hagfishes and lampreys have in common with the extinct conodonts?

TLS Online TPP Program

#Question id: 8907

#9. Diversity of Life Forms

The endoskeletons of most vertebrates are composed of calcified