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To explain:
Why the Mexican beaches become crowded.
Introduction:
In early nineteenth and eighteenth centuries, oil for lubricating the parts of machines and for lamps was harvested from the whales. In mid-1800s, there was a declination in the hunting of whale populations in the eastern Pacific near Mexico and California and the whalers had started hunting the northern elephant seals.
To explain:
Why the California beaches are becoming crowded today with elephant seals.
Introduction:
In mid-1800s, there was a decline in the hunting of whale populations and so, the whalers had started hunting the northern elephant seals. The beaches of California became crowded with the elephant seals.
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Chapter 27 Solutions
Biology: Life on Earth with Physiology Plus Mastering Biology with Pearson eText -- Access Card Package (11th Edition)
- Due to its ability to camouflage itself from predators, the White Peppered Moth of England was once much more abundant than the Black Peppered Moth. As the Industrial Revolution hit, factories began to release black soot which coated everything, including tree bark. Because the moths’ habitat was now darker, the white moth became much more susceptible to predators. At the same time, the Black Peppered Moth was now more protected and began to increase in number.This story is an example of A. natural selection. B. extinction. C. endangered species. D. mutation.arrow_forwardTigers are solitary animals that require vast amounts of forest landscape as their territory to roam. In order to protect one tiger, we must conserve around 25,000 acres of forest. With poaching and deforestation threatening their survival, what are possible solutions to bring tiger populations back from the brink of extinction?arrow_forwardWildebeest are species of antelope found in southern Africa. The wildebeest herd in Serengeti National Park, Tanzania, is the largest herbivore herd on Earth. Scientists began monitoring the sizes of the Serengeti's large mammal populations in the 1960s. Over the next few decades, they noticed something unusual: the wildebeest population was increasing at a rate much faster than before. The scientists determined that this increase was due to several factors. One factor was a vaccination program that eradicated rinderpest, a viral disease that kills wildebeest. Based on the figure, what kind of population growth model would you use to represent wildebeest (circles) populations? wildebeest zebra 1960 1970 1980 1990 2000 year Figure 1. Wildebeest and zebra populations in the Serengeti from the 1950s to 2010. vaccination campaign 00000L 000000 000009 000007 populationarrow_forward
- The Two-Sided Attack on the Spiny Cactus The spiny cactus is a type of plant that lives in a desert environment. A population of spiny cacti shows variation in the number of spines on their outer surfaces. The graph below shows the distribution of the number of spines before the introduction of collared peccaries and parasitic wasps. Spiny Cactus Organism Collared peccary (musk hog) Number of Cacti Parasitic wasp 300 200 100 T Collared peccaries and parasitic wasps are two organisms that were introduced to the ecosystem in which the spiny cactus population lives. The chart describes the relationship between the spiny cacti and these two organisms. 70 1 1 80 90 100 110 120 130 Number of Spines Organisms Introduced into the Ecosystem Relationship with Spiny Cactus Plants They eat spiny cactus plants that have a small number of spines. They lay eggs at the base of cactus spines. When the eggs hatch, the emerging grubs dig into the interior of the cactus and eat the inner pulp of the…arrow_forwardA mile-wide river separates two rabbit populations for a million years. Over time, one population evolves long ears and is more active near dark, when they can hear predators coming but the predators can't easily see their ears sticking up above the grass. The other rabbit population evolves short ears and is more active in the middle of the day; it is harder to see, but also doesn't hear predators approaching as well. Eventually the river dries up, and the rabbits start encountering each other again. What do you predict will initially happen when the populations first start to meet? O rabbits will avoid hybridizing, since it is usually a mistake rabbits will interbreed and have offspring with intermediate ears that are visible during the day and not as good at hearing predators at night O rabbits will know not to mate with any that don't have their same "ear size" O rabbits will already show complete reproductive isolation after one million years and will ignore each other, having…arrow_forwardWhich row below best describes why the population of adult mosquitoes would drop so dramatically during this time period Feb. 5, 2007 Something is wiping out honey bees across North America and a team of researchers is rushing to find out what it is. What’s being called Colony Collapse Disorder (CCD) has now been seen in Pennsylvania, North Carolina, Florida, Georgia and way out in California. Some bee keepers have lost up to 80 percent of their colonies to the mysterious disorder. Whatever kills the bees targets adult workers, which die outside the colony — with few adults left inside, either alive or dead. The disorder decimates the worker bee population in a matter of weeks. Aside from making honey, honey bees are essential for the pollination of tens of million of dollars worth of cash crops all over the United States. That’s why almond growers of California, for instance, are taking notice and pledging funds to help identify and fight the honey bee disorder. Among the…arrow_forward
- Wolves recolonized a large area around Grand Teton National Park (GTNP) in the late 1990’s. Wolf biologists started estimating the number of wolves in 2000 at 21 wolves in GTNP population. In 2010 they repeated their population surveys and counted 105 animals.The population growth rate of wolves is 8 per year.State biologists want to know how long it will take for this population to reach 175 wolves so they can delist them in this region of Wyoming. How long will it take for the population to reach this threshold, assuming growth stays the same?arrow_forwardThe Two-Sided Attack on the Spiny Cactus The spiny cactus is a type of plant that lives in a desert environment. A population of spiny cacti shows variation in the number of spines on their outer surfaces. The graph below shows the distribution of the number of spines before the introduction of collared peccaries and parasitic wasps. Spiny Cactus Organism Collared peccary (musk hog) Number of Cacti Parasitic wasp 300 200 100 70 80 Collared peccaries and parasitic wasps are two organisms that were introduced to the ecosystem in which the spiny cactus population lives. The chart describes the relationship between the spiny cacti and these two organisms. I 90 100 110 120 130 Number of Spines Organisms Introduced into the Ecosystem Relationship with Spiny Cactus Plants They eat spiny cactus plants that have a small number of spines. They lay eggs at the base of cactus spines. When the eggs hatch, the emerging grubs dig into the interior of the cactus and eat the inner pulp of the plant,…arrow_forwardThe Colorado potato beetle has a history of pesticide resistance. The graph shows the number of chemical insecticides used in agriculture that the Colorado beetle population has become resistant to from 1950 to 2010. It took longer for the population of potato beetle to develop a resistance to some insecticides. However, by 1990, the Colorado potato beetle population had developed a resistance to 35 different kinds of insecticides, and farmers ran out of insecticides they could use to control the beetle population. A new type of insecticide was introduced in 1995. 60 40 30 20 10 1960 1970 1980 1990 2000 Year of Report Which of the following best describes what happened from 1965 to 1975 and again from 1995 to 2000 to the insecticide resistance of the beetle population? The Colorado beetle gene pool for insecticide resistance was identical and the insecticide had no effect on the beetle population, which is why it continued to increase. The introduced insecticides were effective for a…arrow_forward
- 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 ______.arrow_forwardIn the year 2005, while studying a population of hippopotamuses in Africa, it was discovered that there were 1793 live births and 1544 deaths in the same population that year. Also, 166 hippos immigrated from a neighbouring place while 402 left. The change in the population size for the hippos in the year 2005 will be?arrow_forwardNow, let's investigate growth in another population: bedbugs! Let's say a college in Kentucky experienced a bedbug infestation, and biology students were asked to help study the problem. Bedbugs are insects that live inside of mattresses (and other similarly warm places) and feed on the blood of sleeping humans. The origin of the bedbug infestation was traced to a student who accidentally brought a few bedbugs in his luggage, after spending a long weekend in New York City. Bedbugs reproduce sexually. In an infested room with a 4 m2 dorm bed, biology students find a population of 1200 bed bugs. In one month, they find that 240 bedbugs die, and 600 new bedbugs hatch. The maximum number of bedbugs is limited by the size of the bed that they live in. What is the density of bedbugs in the dorm bed studied by the biology students? (Explain)arrow_forward
- Concepts of BiologyBiologyISBN:9781938168116Author:Samantha Fowler, Rebecca Roush, James WisePublisher:OpenStax CollegeBiology Today and Tomorrow without Physiology (Mi...BiologyISBN:9781305117396Author:Cecie Starr, Christine Evers, Lisa StarrPublisher:Cengage Learning
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