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TLS Online TPP Program

#Question id: 2057

Lymph nodes and the spleen are the most highly organized secondary lymphoid organs. T-cell and B-cell activity are separated into distinct microenvironments in both. T cells and B cells  are found in

#Unit 4. Cell Communication and Cell Signaling

  1. T cells and B cells are found in the paracortex of the lymph nodes and spleen

  2. T cells are found in the paracortex of the lymph nodes and B cells found in the periarteriolar sheath of the spleen

  3. T cells are found in the paracortex of the lymph nodes. B cells are organized into follicles in lymph nodes  and the periarteriolar sheath of the spleen

  4. T cells are found in the paracortex of the lymph nodes and the periarteriolar sheath of the spleen. B cells are organized into follicles in both organs

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TLS Online TPP Program

#Question id: 4562

#Unit 11. Evolution and Behavior

Which stratum should contain the greatest proportion of extinct organisms?
TLS Online TPP Program

#Question id: 4563

#Unit 11. Evolution and Behavior

If ʺxʺ indicates the location of fossils of two closely related species, then fossils of their most-recent common ancestor are most likely to occur in which stratum?
TLS Online TPP Program

#Question id: 4564

#Unit 11. Evolution and Behavior

Who would have proposed that the boundaries between each stratum mark the occurrence of different localized floods?
TLS Online TPP Program

#Question id: 4565

#Unit 11. Evolution and Behavior

Darwinʹs mechanism of natural selection required long time spans in order to modify species. From whom did Darwin get the concept of Earthʹs ancient age?
TLS Online TPP Program

#Question id: 4566

#Unit 11. Evolution and Behavior

Which of these naturalists synthesized a concept of natural selection independently of Darwin?
TLS Online TPP Program

#Question id: 4567

#Unit 11. Evolution and Behavior

Charles Darwin was the first person to propose