#Question id: 15267
#Unit 13. Methods in Biology
#Question id: 12802
#Unit 10. Ecological Principles
#Question id: 24525
#Unit 11. Evolution and Behavior
__________ is the number of offspring an individual leaves in the next generation
#Question id: 8296
#Unit 9. Diversity of Life Forms
Giardia intestinalis can cause disease in several different mammalian species, including humans. Giardia organisms (G. intestinalis) that infect humans are similar morphologically to those that infect other mammals, thus they have been considered a single species. However, G. intestinalis has been divided into different subgroups based on their host and a few other characteristics. In 1999, a DNA sequence comparison study tested the hypothesis that these subgroups actually constitute different species. The following phylogenetic tree was constructed from the sequence comparison of rRNA from several subgroups of G. intestinalis and a few other morphologically distinct species of Giardia. The researchers concluded that the subgroups of Giardia are sufficiently different from one another genetically that they could be considered different species.
According to the phylogenetic tree in the figure above, G. intestinalis constitutes a ________ group.
#Question id: 1020
#Unit 4. Cell Communication and Cell Signaling
HIV/AIDS can be categorized as a new or emerging infectious disease. By putting it into this category, we are effectively saying that