1. Evolutionary biologists often compare the morphological features of different organisms to look for relationships to determine how they have changed over time. Describe a study an evolutionary biologist might carry out in determining whether two species share a common ancestor, based on morphology. 2.  In a species of turtle, an observable […]

Northern elephant seals have reduced genetic variationprobably because of a population bottleneck humans inflicted onthem in the 1890s. Hunting reduced their population size to as fewas 20 individuals at the end of the 19th century. Their populationhas since rebounded to over 30,000. Which of the followingaccurately describes this situation (check […]

A variety of definitions have been proposed for use in identifying species for conservation including: Proposal 1: A population that is morphologically distinct from other similar populations.Proposal 2: A population that is substantially reproductively isolated from conspecific populations.Proposal 3: A populationthat represents an important component in the evolutionary legacy of […]

Q1. Several people habitually use barbiturates to depress feelings of anxiety. Barbiturates cause hypoventilation that is the slower-thannormal rate of breathing, since they suppress the respiratory centers in the brain. What happens to the red blood count of a habitual user of barbiturates? Explain in details. Q2. A paleontologist has […]