Scientists estimate that whaling activity in the nineteenth and early twentieth centuries reduced the number of adult female southern right whales to as few as 60 by 1920. This is an example of ______.
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Scientists estimate that whaling activity in the nineteenth and early twentieth centuries reduced the number of adult female southern right whales to as few as 60 by 1920. This is an example of ______.
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- Discuss reasons why gray whales leave their cold-water feeding grounds during the winter season.Most remote oceanic islands have at least one unique species of flightless bird that shows little or no fear of humans or other large predators. Account for this observation.Two related species of salamanders were found living on opposite sides of a mountain. One species lives in along a shady forest stream on the leaf covered-ground and is brown with dark green spots. The other species live along the bright, sandy banks of a larger river is light tan in color. What is most likely cause of the difference between these two species of salamander? Group of answer choices Competition Predation Mating seasons Different habitats
- Consider the recent introduction of wolves into Yellowstone National Park. explainhow reintroducing wolves into the Yellowstone area could have such a significantimpact on the physical landscape of Yellowstone National Park.Many species of birds have elaborate mating rituals that include bird calls, nest construction, and courtship displays. A researcher is comparing two populations of birds with similar morphology that live in similar niches. Male birds in one population build a nest before attempting to court a female, while males in the other population build the nest in cooperation with the female. Is it likely the researcher will classify these birds as the same species?What is the nature of the reproductive barrier between a species that mates at dawn (sunrise) and a species that mates at dusk (sunset)? gametic temporal habitat behavioral mechanical One insect species mates on goldenrod flowers, while a second species mates on autumn daisies. The two species are mechanically compatible and the flowers bloom at the same time, but the insects do not interbreed. This is an example of __________ isolation. temporal habitat gametic mechanical behavioral
- imagine that you have a population of monkeys the variety within the species allows for monkeys to be long tailed or tailless; carnivorous or herbivorous; and brown or blonde furred. Describe an example of an environmental change to happen to these monkeys that over many generations?In the Northern Hemisphere, many species of birds fly south during the autumn months. Propose a proximate and an ultimate cause for this behavior.What was responsible, in part, for the Migratory Bird Treaty Act, which was passed in 1918? changes in climate increased interest in hunting lack of breeding grounds fashion trends that required bird feathers
- If two salamanders from different species cannot mate because one mates in spring and the other in fall, this is what kind of isolation? Group of answer choices A. behavioral B. mechanical C. habitat D. temporal E. gameticYou are surveying of the turtle species identifies several breeding populations in different habitats across the island. After a very warm summer of 2020, you observe that the hatchlings from low-elevation nests are mostly males, whereas hatchlings from higher elevations have an equal female-to-male sex ratio. As a bit more background, temperature influences the sex ratio in some turtle species, a phenomenon called temperature-sex determination (TSD). With this knowledge, you hypothesize this new turtle species exhibits TSD, and that eggs incubated at low elevations during the warm year experienced a high enough embryonic temperature to skew the sex ratio. To test this, you collect 20 newly laid eggs in early 2021 & take them back to the lab to conduct an experiment to test your hypothesis that this species exhibits TSD. Assume you know the average nest temperature in the wild, and you have access to multiple incubators Design an experiment to test the hypothesis that this turtle…At the edge of the Arctic Circle, owls prey on field mice. Occasionally, in a litter of white field mice, a brown mouse appears. Because of greenhouse warming, the snow melts, changing the environment to shades of brown. What is most likely true regarding the brown mice before the greenhouse warming? The brown mice population was large in number. The brown mice population was small in number. The fur color of mice changed to white because they needed to survive. There were no brown mice born before greenhouse warming.