The following question refers to this phylogenetic tree, depicting the origins of life and the three domains. Horizontal lines indicate instances of gene or genome transfer.
A possible phylogenetic tree for the three domains of life.
Which of these processes can be included among those responsible for the horizontal components of the figure?
Definitions:
Behavioral Medicine
An interdisciplinary field concerned with developing and integrating behavioral and biomedical sciences.
Interleukins
A group of cytokines that plays an important role in the immune system by helping to fight infections and diseases.
Cytokines
Chemical messengers secreted by cells in the immune system, forming a communication link between the nervous and immune systems.
Leukocytes
White blood cells that are part of the immune system, involved in protecting the body against both infectious disease and foreign invaders.
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