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Answer: C. Tropical Rainforest Tropical rainforests are one of the most biodiverse ecosystems in the world. They are home to millions of species of plants and animals, and they are known for their dense canopies and lush vegetation. The high

Answer: B. It warms the lower atmosphere. Explanation: Greenhouse gases are molecules that absorb and emit radiation within the thermal infrared range. When solar radiation enters the atmosphere, some of it is reflected back to space and the rest is

Answer: Extinction Rate in Different Areas The extinction rate is predicted to be higher in areas that are inhabited by humans. This is due to human activities, such as deforestation, overfishing, and the spread of diseases, that can lead to

Answer: C. Polar Region The coldest climates on Earth can be found near the poles of the planet, in the polar regions. This is because the poles receive less direct sunlight than other parts of the planet, and the sun’s

Answer: Elephants are prone to extinction due to multiple factors Elephants are amongst the most endangered species on the planet, with their population declining rapidly due to various factors. These factors include being large in size and slow-moving, requiring large

Answer: B. Erosion Control Erosion control is among the most economically valuable of the ecosystem services, with the ability to reduce damage to infrastructure, prevent sedimentation of waterways, and protect crops from soil loss. These services are immensely valuable, as

ANSWER: Biodiversity Should Be Protected For Many Reasons Biodiversity should be protected for many reasons, but the most important is that all organisms have the right to exist on Earth. Biodiversity contributes to the health of ecosystems and the planet,

Answer: Which of the following is an example of a deliberately introduced nonnative species? The correct answer is C. Argentina Fire Ant. A nonnative species is an organism introduced to an area where it is not native, either intentionally or

Answer A Zebra Mussel is an example of a deliberately introduced nonnative species. Explanation A Zebra Mussel is a species of small freshwater mussel native to the Caspian Sea and Black Sea regions, but it has been deliberately introduced to

Answer: C. Zebra Mussel The zebra mussel (Dreissena polymorpha) is a nonnative species that was deliberately introduced to North America from Europe in the late 1980s. It is a small, freshwater mollusk that is known for its rapid growth, high

Answer: A. It expands and rises. Summary When air is heated, it expands and rises. This phenomenon is known as the convection process which is caused by the differences in the density of warm and cold air. How the Convection

Answer: Option D – Extinction of Specialist Species Overview Deforestation is the conversion of land from forests to other land uses such as urban, agricultural, or industrial development. It is one of the most significant drivers of ecosystem destruction and

Answer The correct answer is A. Ozone. Ozone is a naturally occurring gas in the stratosphere, which is located between 6 and 30 miles above the Earth’s surface. Ozone protects the Earth from the Sun’s harmful ultraviolet rays, but it

Answer: C. Predation Predation is an interaction between two species in which one species, the predator, hunts and kills the other, the prey. In the case of a lion feeding on a zebra, the lion is the predator and the

Answer: A density-independent factor limiting human population growth could be social pressure for birth control, earthquakes, plagues, or famines. Social Pressure for Birth Control Social pressure for birth control has been a major factor in limiting human population growth. There

Answer: C. Indicator Species Indicator species are species that provide early warnings of environmental change in a community or an ecosystem. They provide valuable information about the health of an ecosystem and can be used to identify and measure changes

Answer Summary The rapid rise in human population can be attributed to early and modern agriculture development, technological advancement, a decrease in death rates, and vaccine and antibiotic developments. Early and Modern Agriculture Development Agriculture has been a major factor

Answer: C. Overconsumption More-developed countries have higher rates of resource use per person than less-developed countries, and this issue is known as overconsumption. Overconsumption occurs when individuals and societies consume more resources than they need. This can lead to environmental

Answer: D. Reproductive Ages The reproductive age category includes human individuals that are capable of reproduction. This age range generally includes individuals between puberty and menopause. This age category is mainly characterized by the ability to reproduce and the presence

Summary The interactions between cellulose-digesting organisms in the gut of a termite and the termite are varied. These interractions can include competition, commensalism, herbivory, and mutualism. Competition Competition is a type of interaction between the termite and cellulose-digesting organisms in

Answer: Cellulose-Digesting Organisms in the Gut of a Termite Cellulose-digesting organisms are found in the gut of a termite, and there are several interactions that exist between them and the termite. These include competition, commensalism, herbivory, and mutualism. Competition Competition

Cellulose-Digesting Organism and Termites Interactions The interactions between cellulose-digesting organisms in the gut of a termite and the termite are mutualism. This is a mutually beneficial relationship between the organisms and the termite. The cellulose-digesting organisms break down the cellulose

Answer: Speciation Speciation is the process in which one species splits into two or more different species. This process is driven by changes in a population’s environment, genetic drift, or the emergence of a new gene mutation. Speciation is a

Answer: Darwinian Theory Darwinian Theory states that species with the greatest reproductive success are the fittest and have the best chance of evolutionary success. The individuals within a population that have the greatest reproductive success, (Option C), are the ones

Answer: Mutualism Mutualism is an interspecific relationship between two species where both species benefit from the exchange. In the example of a tree and bird, the tree offers the bird a safe nesting site while the bird eats the insects

Mutation Mutation is a process of change in the DNA molecules of a gene in any cell that can be inherited by offspring. It can be defined as any process of change in the structure of a gene. Mutations can

Answer: Total Fertility Rate The total fertility rate (TFR) is a measure of the average number of children that would be born to a woman over her lifetime if current age-specific fertility rates remain constant. It is calculated by summing

Answer: Which of These Individuals is Likely to Be Most Successful in an Evolutionary Sense? The most successful individual in an evolutionary sense is D, an organism that dies after five days of life but leaves 10 offspring, all of

Answer: The Human Population Growth Curve The human population is currently exhibiting an S-Curve growth. This means that the population is growing exponentially and then slows down as it approaches a peak. This peak is known as the carrying capacity,

Answer: Keystone Species Top predators such as wolves and lions are considered keystone species. Keystone species are species that have a disproportionately large impact on their ecosystem relative to their abundance. They play a critical role in the functioning of

Answer: The Basic Unit of Evolution is the Individual Evolution is the process of change and adaptation over time, and the basic unit of evolution is the individual. Every organism is made up of many cells, and each cell contains

Answer: B. These refer to descent with modification from a common ancestor Summary Adaptations are inherited characteristics of organisms that enhance their survival. Adaptations are the result of descent with modification from a common ancestor, and are passed down to

Answer: What Are Adaptations? Adaptations refer to inherited characteristics of organisms that enhance their survival in a particular environment. Adaptations can be physical or behavioral, and are usually the result of a process of natural selection. This process leads to

Answer: Carrying Capacity Carrying capacity is the maximum number of individuals that an area can support. It is the population size of a species that can be sustained in a given environment without causing the environment to deteriorate or becoming

Answer: Factors That Lead to a Decrease in Human Population Humans are a species that has the potential to experience population growth or decline, depending on a variety of factors. Three of the most common factors that can lead to

Answer: Problem of Overpopulation in a Country The problem of overpopulation in a country can have a dramatic impact on the environment and resources available to the people living there. This can lead to a range of issues such as

Answer: Which of the following is NOT true of generalist species? The correct answer is A. They only inhabit one type of habitat. Generalist species are those that have adapted to survive in a wide variety of habitats and environments.

Answer The correct answer is C: Emigration. Emigration is the act of leaving one’s country or region to settle in another. Definition of Emigration Emigration is the act of leaving one’s country or region to settle in another. This term

Answer: C. Birth rate The term birth rate refers to the number of offspring produced in a standard time. This is usually expressed as a percentage of the population, and can be used to gauge the overall health and growth

Answer The correct answer is D. Size. Size refers to the total number of individuals in a population, while Growth is the rate at which the population is increasing or decreasing over time, Dispersion is the arrangement of individuals within