Due to increasing concentrations of ddt as one moves up the food chain, cormorants and mergansers have about ______ times as much ddt residue as the background concentration in the water.

Organisms that are both secondary and tertiary consumers in a food web are usually larger predators that can eat a variety of other organisms. An example of this is the Chinook salmon in the Lake Ontario food web, which eats both primary and secondary consumers.

In a food web, the organisms that act as both secondary and tertiary consumers are typically flexible predators. These are usually larger animals that can feed on a variety of organisms occupying different levels of the trophic system. For instance, in the Lake Ontario food web, an apex predator like the Chinook salmon is both a secondary and tertiary consumer because it feeds on both primary consumers (like herbivorous fish) and secondary consumers (other carnivores).

These organisms that occupy more than one trophic level can vary widely among different ecosystems. Yet, they are important in food webs since they illustrate the complexity of energy transfer among various organisms, helping to maintain balanced biodiversity.

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Odysseus is described with various epithets in Homer's Odyssey, including but not limited to:  Resourceful Odysseus, Much-enduring Odysseus, Great-hearted Odysseus, Sacker of Cities, Lord of Ithaca .

1. Resourceful Odysseus  - This epithet reflects Odysseus's cleverness and his ability to devise intricate plans and inventions, such as the Trojan Horse.

2. Much-enduring Odysseus  - This epithet highlights Odysseus's perseverance and his ability to withstand numerous trials and tribulations throughout his journey.

3. Great-hearted Odysseus  - This epithet emphasizes Odysseus's bravery and the nobility of his spirit.

4. Sacker of Cities  - This epithet refers to Odysseus's role in the Trojan War, particularly his idea for the Trojan Horse, which led to the fall of Troy.

5. Lord of Ithaca  - This epithet denotes Odysseus's status as the king of Ithaca and his rightful place as the ruler of his homeland.

These epithets are not only descriptive but also serve to remind the audience of Odysseus's various attributes and his role in the epic poem. They are a characteristic feature of Homeric poetry, providing a rich tapestry of attributes that define the heroic figures within the narrative.

After lymph nodes are surgically removed, there would be an immediate disruption in the lymphatic system. This can result in lymphedema, a condition characterized by localized fluid retention and tissue swelling due to impaired lymphatic drainage. Over time, new lymph vessels eventually grow to help restore function.

Following surgical removal of lymph nodes, there tends to be an immediate disruption in the functioning of the lymphatic system. Lymph nodes are an essential part of the lymphatic system, playing a vital role in your body's ability to fight off illness and dispose of old cells. The lymphatic vessels, which feed into larger vessels and eventually into bloodstream via a series of ducts, are important pathways for the flow of lymph which travels through the lymph nodes.

Immediately post-surgery, lymphatic drainage in the affected area may be impaired leading to a condition known as lymphedema, characterized by localized fluid retention and tissue swelling caused by a compromised lymphatic system. This happens since lymph -- a fluid containing infection-fighting white blood cells -- can't easily be transported and drained through the network of lymphatic vessels when lymph nodes have been removed.

Over time, as the body heals and recovers, new lymph vessels often eventually grow to help restore function of the lymphatic system.

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True

Radiopharmaceutical is also known as medicinal radiocompounds and they can be used as therapeutic and diagnostic agents inform of pharmaceutical drugs with radioactivity.  Thus, radiopharmaceuticals are organic molecules. In Radiopharmaceutical, organic molecule conveys the radioisotope to specific organs, cells or tissues.

Species with a large impact on community structure despite their low abundance are known as keystone species, which are critical to the ecosystem's balance and can cause significant changes if their numbers fluctuate substantially.

Species that have a disproportionately large effect on community structure relative to their abundance are called keystone species. These species play an especially important role in their communities, and major changes in their numbers can significantly affect the populations of many other species. Despite constituting only a small proportion of their ecosystem's overall living biomass, keystone species have such important roles that their disappearance would lead to drastic environmental changes. In contrast, foundation species often have the highest relative abundance and are considered the 'base' or 'bedrock' of a community, typically being primary producers and abundant. Keystone species, however, may not be as abundant but have major community effects even in environments where species richness is low.

Answer:

Explanation:

Because only hard organisms have a highest chance to become fossils, like bones, teeth and shells. That's why is false.

To some organism become fossil also has to be quickly buried, this way is going to preserve, if the organism is eaten or in decomposition phase, chances to become fossil are almost null.

Smog

Smog refers to brownish hazy air formed as a result of the mixture of various gases such as hydrocarbons, nitrogen oxides and other small particulate matter chemically in the presence of sunlight. Smog is an air pollutant that makes breathing difficult for humans.

It is descent bro/sis

Dogs can die from bloat, which is a medical emergency also known as gastric dilatation-volvulus (GDV). Bloat occurs when the stomach fills with gas, fluid, or food, causing it to expand. The expanded stomach can then twist, cutting off blood flow to the stomach and sometimes the spleen, which requires immediate veterinary intervention to save the dog's life.

The term 'bloat' in dogs refers to two conditions: gastric dilatation, which is the stomach expanding due to excess gas, and volvulus, the subsequent twisting of the stomach. When the stomach twists, it seals off the entrance and exit, trapping whatever is inside and preventing the release of the build-up. This can cause a rapid drop in blood pressure, shock, and damage to internal organs due to the lack of blood circulation and oxygen. If left untreated, gastric dilatation-volvulus can lead to a rapid decline in the dog's condition, resulting in death. Additionally, the expansion puts pressure on the diaphragm, making it difficult for the dog to breathe. The risk of bloat is higher in large breeds with deep chests, such as Great Danes and St. Bernards, although any dog can suffer from this condition.

Helper T cells stimulate B cells to produce antibodies. They bind to the antigen-MHC class II complex and induce the B cells to divide into plasma cells which produce the antibodies, or memory B cells which lie in wait for a future encounter with the same antigen.

The type of cell that helps to stimulate B cells to produce antibodies is the Helper T cell. The helper T cell binds to the antigen-MHC class II complex and releases cytokines. These cytokines induce the B cell to divide rapidly and create thousands of identical cells that either become plasma cells or memory B cells. Plasma cells are the ones that produce and secrete the antibodies.

Antibodies, also known as immunoglobulins (Ig), are proteins produced by plasma cells in response to an antigen. They play a critical role in immune response by binding to the antigens on pathogens and marking them for destruction by other immune cells. Memory B cells, on the other hand, stay inactive until they encounter the same antigen in a future infection, at which point they quickly divide and produce more plasma cells.

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Viruses reproduce by infecting a host cell and using the host's cellular machinery to replicate. Unlike other organisms, they do not undergo cell division.

How Viruses Reproduce:

Viruses replicate by infecting a host cell, as they cannot reproduce on their own. Unlike other organisms, they don't grow through cell division because they are not cellular organisms. Instead, they are essentially a strand of genetic material (either DNA or RNA) enclosed within a protective protein coat called a capsid. Once a virus has infected a host cell, it uses the cell's ATP, ribosomes, enzymes, and other machinery to produce new viral particles.

Viral Reproduction in Different Cellular Environments:

In prokaryotic cells, such as bacteria, viruses known as bacteriophages replicate in the cytoplasm. In eukaryotic cells, DNA viruses generally replicate inside the nucleus, except for some large DNA viruses like the poxviruses, which can replicate in the cytoplasm. RNA viruses usually replicate in the cytoplasm of animal cells, with notable exceptions like the Influenza virus.

The rapid replication of viruses, with their smaller amounts of genetic material compared to cells, can lead to mutations and the evolution of new strains that may infect different hosts. This aspect is critical in the study of emerging viruses and global viral epidemics.

When climbing a mountain, we can observe transitions in biological communities that are analogous to the changes in biome.

A biome is a biogeographical unit consisting of a biological community that has formed in response to the physical environment in which they are found and a shared regional climate.

Moreover, biomes may span more than one continent. Biome is a broader term than habitat and can comprise a variety of habitats.

Therefore, a biome is an area classified according to the species that live in that location. Temperature range, soil type, and the amount of light and water are unique to a particular place and form the niches for specific species allowing scientists to define the biome.

Learn more about biome:

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Final answer:

The correct option is: in biomes at different latitudes. Climbing a mountain demonstrates the changes in biomes analogous to those observed at different latitudes due to variations in abiotic factors such as temperature and rainfall, contributing to ecosystem diversity.

Explanation:

When climbing a mountain, we can observe a transition in biological communities that is analogous to the changes in biomes at different latitudes. These shifts correspond to variations in physical conditions such as temperature and precipitation, which impact the species adapted to different environmental niches resulting in ecosystem diversity. An example of this would be hiking up Africa's highest mountains, where climbers might traverse tall lowland forests into grassy alpine meadows and then onto cold, windy mountain peaks, each with its distinct community of plants and animals. This phenomenon is influenced by the same abiotic factors, like temperature and rainfall, that change with latitude, creating different biome types as one moves from the equator towards the poles or ascends a mountain.

Final answer:

Most common observers of the ocean fail to observe ocean currents because they are intricate and not easily detectable without advanced technology such as satellites and autonomous instruments; even these data sources are insufficient for a full understanding, leading to the use of numerical models for a global view.

Explanation:

The reason most common observers of the ocean fail to observe ocean currents is mainly because these currents are a subtle and complex phenomenon not easily detectable by simple observation. Almost all our observations of the ocean now come from satellites, drifters, and autonomous instruments rather than from ships. The ocean's turbulent nature means that many years of observations may be needed to obtain a stable map of the mean flow, and the samples we have of the ocean are insufficient to describe its full complexity, leading to conceptual oversimplifications. For the deep circulation, which is even less observable due to its slow-moving nature and the variability of current speeds, advanced technology like moored current meters or deep-drifting floats is required to make satisfactory observations, and their long-term data is sparse. Therefore, numerical models currently provide the most comprehensive global view of ocean currents.

T cells are the type of cell the immune system uses to fight infections. They come in three types: cytotoxic, helper, and suppressor T cells.

The type of cell the immune system uses to fight infections is T cells.

T cells are a key component in the cell-mediated immune response. There are three types of T cells: cytotoxic, helper, and suppressor T cells. Cytotoxic T cells destroy virus-infected cells, helper T cells activate both the antibody and cell-mediated immune responses, and suppressor T cells deactivate T and B cells.

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Answer is embryos of dissimilar organisms such as sharks and humans, resemble each other.

Further explanation

Embryology

Embryology is the study that reviews the pre-birth development of gametes (sex cells), preparation, and advancement of incipient organisms and babies. Furthermore, embryology envelops the investigation of inherent issue that happen before birth, known as teratology. The initial three weeks of the developing life, portrayed in three dimensions. Embryology has a long history. Aristotle proposed the as of now acknowledged hypothesis of epigenesis, that living beings create from seed or egg in a succession of steps. The elective hypothesis, that creatures create from previous little forms of themselves, in any case, held influence until the eighteenth century. Present day embryology created from crafted by von Baer, however precise perceptions had been made in Italy by anatomists, for example, Aldrovandi and Leonardo da Vinci in the Renaissance.

Evolution

It is the investigation of how various kinds of living beings adjust and change after some time. New species rise continuously while others go wiped out in light of fluctuating natural conditions.

How embryology provides evidence of evolution

The investigation of one sort of proof of advancement is called embryology, the investigation of developing lives. An incipient organism is an unborn (or unhatched) creature or human youthful in its soonest stages. For instance, fish developing lives and human incipient organisms both have gill cuts. In fish they form into gills, yet in people they vanish before birth.

Answer details

Subject: Biology

Level: High school

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