Related questions in Biology
and consequent erosion, as well as decreased river flows. Research on the impact of invasive alien plants on water resources has historically focused on water quantity. However, although invasive alien plants also affect the quality of water, this aspect has not been well documented. Alien invasive plants increase evaporation rates, and reduce stream flow and dilution
capacity. The biomass inputs of alien invasive plants, especially nitrogen fixers such as Acacia spp., alter nutrient cycles and can elevate nutrient concentrations in groundwater. Alien plant invasions alter the fire regimes in invaded areas by changing the size, distribution and plant chemistry of the biomass. More intense fires increase soil erosion and thereby decrease
water quality. In contrast to riparian invasions, aquatic invasive plants have been more extensively studied in South Africa and their impacts on water quality have been relatively well monitored. Water quality in South Africa is rapidly deteriorating, and all factors that influence this deterioration need to be taken into account when formulating actions to address the problem. The changes in water quality brought about by alien plant invasions can exacerbate the already serious water quality problems.
3. How are populations, ecosystems, and communities related? (1 point) A. A community consists of an ecosystem and its physical environment, and an ecosystem is made up of many different populations of organisms. B. A population consists of a community of organisms and its physical environment, and a community is made up of many different ecosystems. C. An ecosystem consists of a community of organisms and its physical environment, and a community is made up of many different populations of organisms. D. An ecosystem consists of a population of organisms and its physical environment, and a population is made up of many different communities of organisms.
Ostriches don’t use their wings for flight, but they do use them for other functions, such as mating rituals and balance. Many ancestors of ostriches did fly. What can you conclude about ostrich behavior from this information? A)Ostriches inherited the genes for wings from their ancestors, even though the function of these structures changed. B)Ostriches developed mutations in their wings to willfully adapt to their current environment. C)Ostriches lack a close evolutionary relationship with these ancestral birds. DIn the near future, ostriches will have no wings because they have no need for them.
The right option is; A. Ostriches inherited the genes for wings from their ancestors, even though the function of these structures changed.
From this information, what can be concluded about ostrich behavior is that ostriches inherited the genes for wings from their ancestors, even though the function of these structures changed. The wings of the ostriches are called a vestigial structure. Species inherits the genes for vestigial structures from their ancestors but these structures have lost some or all of their ancestral function. In species, the structures do not function the same way they functioned in the specie’s ancestor. This may occur due to a mutation in their genome.
The early ancestors of horses showed the presence of digits on their limbs, while modern horses have hooves. What are likely possible reasons for this change? (more then one answer) 1.asexual reproduction 2.evolution 3.genetic mutations 4.selection 5.willful adaptation to environment
The correct answers are evolution, genetic mutation and selection.
The early ancestors of horses showed the pressence of digits and now the modern horses have hooves in their limbs. There could be many reasons for the pressence of hooves horses.
These could be due to the genetic mutations, which could have changed the shape of the digits in the limb. Sudden change in DNA can cause mutation and this mutation can change the phenotype of the horse.
There are chances that evolution took place over a period of time that changed the character in the horse.
Natural selection can also be one of the reason for the change in the phenotype of the digits on the limb of the horses.
Logging companies own significant amounts of land in the coastal ranges of California and typically hold onto their land for many decades. Their most important harvest is the redwood tree, which thrives, in moist, cool environments. The many small creeks that run through the coastal ranges support aquatic organisms including algae, fish, and invertebrates such as insect larvae and crustaceans. Because logging disturbs the soil, causing sediment to erode into the creeks, environmentalists have pushed for regulations preventing logging within a specified number of feet from all creeks. However, if the logging companies were given a choice, they would prefer to log the trees very close to the creeks. 1. Using the concepts of limiting factors and primary productivity, explain why the logging companies would like to be able to log next to the creeks. 2. Consider the effect that logging next to the creeks could have on the primary productivity within the creek. Explain two abiotic factors that could be changed by the logging and whether each of these changes would be expected to increase or decrease the primary productivity of the creek ecosystem.
8. What is meant by a “natural library” of genetic information in reference to biodiversity? (1 point) A. The biodiversity of plants and animals is interesting to read about. B. All living organisms contain genetic information that humans can research. C.Species provide humans with many useful products to enhance our lives. D.We have much to admire in the many forms of life that surround us. 9. Using environmental resources in a way that does not cause long-term environmental harm is like (1 point) A. spending only as much money as you earn. B.borrowing money that you cannot pay back for a long time. C.printing more money when you need it. D.lending money to people who can’t pay it back.
8. Is B.) and 9. Is A.)
6. The nutrient availability of aquatic ecosystems is the (1 point) A.amount of nitrogen, oxygen, and other elements dissolved in the water. B.number of other organisms present in the water. C.amount of rainfall the water receives. D.number of different animal species living in the water. 7. In a logistic growth curve, exponential growth is the phase in which the population (1 point) A.reaches carrying capacity. B.grows quickly. C.growth begins to slow down. D.growth stops.
6. is A.) 7. Is B.) are the correct answers
1)Radiation is a a. form of plastic. c. byproduct of factory smoke. b. byproduct of atomic energy. d. form of acid rain. 2)Who was Yury Gagarian? a. He created the steam engine. c. He was the first environmentalist to write a national book. b. He created the Chunnel. d. He was the first man in space. 3)Jets, high speed trains, highways and the increase of automobile ownership means that people travel more __________. a. easily c. cautiously b. quickly d. a and b
Chemosynthesis is : the process of breaking down sugars to get energy the process of making organic food molecules in the absence of light the internal biochemistry used by organisms to make ATP the transfer of chemicals against or opposite the concentration gradient
The Galapagos Islands are a home to many endemic species. These species are found nowhere else on Earth. The picture shows some examples of marine iguanas and how they differ from island to island. On Isabella, they are huge, mostly dark, and have huge spikes down their back. On Espanola, they are very colorful. On Fernandina, they are dark and moderate in size. How did these iguanas, with such physical differences from island to island, change over time? A) The different populations of iguanas on each island were established separately. Each population originated from S. America and most likely came over on floating vegetation. B) According to the theory of evolution, the individual selects which traits are best suited to the environment and chooses to pass these traits on to offspring. Because the island populations are isolated from each other, these differences accumulate over time. C) Marine iguanas acquire traits that are best suited to them during their lifetime and pass on these traits to their offspring. For example, some iguanas who need protection, will grow larger spikes on their head. This trait will then be passed to their offspring. D) An original population of land iguanas came over on floating vegetation from South America. Over time, two species evolved, land and marine. Marine iguanas made their way to different islands and once isolated on their own islands, accumulated adaptations most suited to their island.
How is a mantle plume (hot spot) different from volcanoes in the Ring of Fire? How are they similar? Give one specific example of a hot spot volcano.
The difference between a hot spot volcano and the volcanoes from Ring of Fire can mainly be seen in the way of formation and functioning. The hot spot volcanoes are far away from any tectonic plate boundary and they manage to penetrate the crust over them and come out on the surface to usually create volcanic islands. The activity of the volcanoes from the Ring of Fire depends directly from the activity between the bordering tectonic plates, and as the borders move over time, the volcanoes stop existing, and new ones rise in the direction where the boundary moves.
The similarity can be seen in the type of eruptions, and that usually both types of volcanoes form volcanic islands.
Example for a hot spot volcano is Mauna Loa on Hawaii.
Flower growth along the stems of pea plants (axial) is dominant over growth from the tips of the stem (terminal). The letters Aa are used to represent the genotype for flower position of a particular pea plant. Which of the following statements is a way to describe the plant’s phenotype? The plant demonstrates both axial and terminal flower growth. The plant demonstrates heterozygous axial flower growth. The plant is heterozygous dominant. The plant demonstrates axial flower growth.
Burning of paper is chemical change
A biologist wants to test some lake water for the presence of nitrates. He has a sensor that detects even the tiniest amount of nitrates by turning an internal light from green to red. A) what will be his positive control? (Specific). B) What will be his negative control? (Specific). C) Why does he need o include these controls?
b) the negative is that, he will obtain carbon(iv)oxide.
c) the reason for the applicant of this controls is that nitrogen he will obtain will be used for laboratory preparations.
Your visual receptors have begun to detect, convert, and transmit the contours of the letters on this exam to your brain. you are therefor engaged in the process of
What was the most important development in the biological and medical sciences in the late 19th and 20th centuries based on the work of roy porter and ernst mayr?
The answer is greater leaf surface area.