#Question id: 4645
#Unit 11. Evolution and Behavior
The treeʹs horizontal axis is a timeline that extends from 100,000 years ago to the present; the vertical axis represents nothing in particular. The labeled branch points on the tree (V—Z) represent various common ancestors. Letʹs say that only since 50,000 years ago has there been enough variation between the lineages depicted here to separate them into distinct species, and only the tips of the lineages on this tree represent distinct species.
Which of the five common ancestors, labeled V—Z, has given rise to the greatest number of species, both extant and extinct?
#Question id: 29070
#Unit 10. Ecological Principles
Which of the following prediction is applicable for semelparous reproductive strategy?
#Question id: 699
#Unit 1. Molecules and their Interaction Relevant to Biology
The three-dimensional conformation of a protein may be strongly influenced by amino acid residues that are very far apart in sequence. This relationship is in contrast to secondary structure, where the amino acid residues are:
#Question id: 18073
#Unit 11. Evolution and Behavior
#Question id: 9182
#Unit 9. Diversity of Life Forms
Imagine that a deep temperate zone lake did not turn over during the spring and fall seasons. Based on the physical and biological properties of limnetic ecosystems, what would be the difference from normal seasonal turnover?