What prevents bacteria and materials in the large intestine from flowing backward into the ilieum of the small intestine?

The correct answer is option A which is pesticides and fertilizers can poison soil organism.

Pesticides, insecticide, and fertilizers are given to crops for better production.

Pesticide kills the pests, insecticide control the harmful insects for the field and fertilizers provides nutrients to plants/crops for fast growth.

But all these are chemicals which leads to the death of organisms in the soil, especially nitrifying bacteria.

These bacteria and other worm-like organism are very important for natural betterment of soil and crop which can be disrupted by fertilizers and insecticides.

Pseudostratified columnar epithelial tissue with cilia is located in the linings of the trachea as well as the upper respiratory tract. The presence of pseudostratified columnar epithelium with cilia in the upper respiratory tract protects the lungs from the effects of large dust particles, pollutants,corrosive agents and pathogens as the goblet cells of the epithelium secrete mucus to trap these particles and prevent them from traveling further down respiratory passages.

Pseudostratified columnar epithelial tissue with cilia is found in the lining of the respiratory tract. It has a protective role in preventing unwanted particles from entering the lungs.

Pseudostratified columnar epithelial tissue with cilia is predominantly found in the respiratory tract of humans. This particular type of epithelial tissue is characterized by a single layer of cells that appears layered due to the varying positions of the nuclei within the cells. The role of the cilia on these cells is to trap and transport mucus and dust particles upwards to prevent them from entering the lungs, hence providing a crucial protective role for the respiratory system.

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Answer:

D (characteristics of living things)

Explanation:

All things in existence are made up of matter, which can either be living or non-living depending on whether or not they have LIFE in them. This means that the possession of life distinguishes a living thing from a non-living thing. This life that living things possesses makes them able to perform certain functions called their characteristics.

Based on these, the characteristics of living things have been summarized into an acronym called MR NIGER D with each letter meaning a particular characteristic.

M- Movement (ability to move)

R- Reproduction (ability to produce young ones)

N- Nutrition (ability to absorb nutrients)

I- Irritability (ability to respond to stimulus in the environment)

G- Growth (ability to increase in size, weight and height)

E- Excretion (ability to pass out waste products from the body)

R- Respiration (ability to obtain energy)

D- Death (ability to die)

Looking at all these characteristics, they are possessed by insects, plants, animals, humans etc. Hence, they are all grouped as living things.

The crop in earthworms functions as a storage area and has less muscular walls, while the gizzard is heavily muscular to enable it to grind and churn the soil and organic matter. This reflects their different roles in digestion. A similar distinction is seen in birds, where the gizzard contains grit to grind food.

The muscularity difference between the crop and the gizzard of an earthworm centers on their respective functions in the digestive system. The crop is a thin-walled organ that primarily serves as a storage compartment, allowing earthworms to ingest more soil and organic matter than they can immediately digest. It is not heavily muscular as it does not need to contract vigorously. In contrast, the gizzard is a thick, muscular organ designed to churn and grind the soil and organic matter ingested by the earthworm. The muscular walls of the gizzard are much stronger because they must contract powerfully to pulverize the food, which aids in the breakdown and digestion process. This difference in muscularity reflects the different roles these two organs play in the digestion process. Whereas the crop holds food in preparation for digestion, the gizzard actively participates in the mechanical breakdown of food.

In birds, a similar distinction exists. The crop functions as a storage area to moisten and soften food, while the gizzard, often enhanced with swallowed stones or grit, serves the purpose of grinding the food before digestion. Grain-eating birds, for example, possess a well-developed gizzard with ridges to enhance this grinding process, which compensates for the absence of teeth.

Mature human sperm and ova are similar in that they both have the same number of chromosomes. The human sperm and ova are the reproductive cell in male and female respectively. The sperm cells are motile while the ova are not. A mature human sperm and ova both contain 23 pairs of chromosomes.

Mature human sperm and ova are similar in that they have the same number of chromosomes (23), making them haploid cells. However, there are notable differences in their size, structure, and rate of creation. Specifically, only sperm possess a flagellum for motility and are produced in much larger numbers.

Mature human sperm and ova are similar in that they both have the same number of chromosomes, which is 23. This is half the number present in body cells, making them haploid cells. This is important as it allows the zygote, the cell formed after fertilization, to have the correct number of chromosomes (46).

Regarding size and motility, mature sperm and ova exhibit differences. For instance, sperm cells are much smaller than most cells, including the ovum or oocyte (female gamete). Only the sperm cell possesses a flagellum, a tail-like structure, that provides it motility, enabling it to swim towards the ovum for fertilization.

The production of sperm and ova also varies. Approximately 100 to 300 million sperm are produced daily, whereas typically only one oocyte is ovulated per month in females.

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It's actually Natural Selection

Answer:

Extinction of even a single keystone species will cause significant change to the ecosystem. Extinction of a species that is easily replaced by others may have little impact

Explanation:

The two groupings that the scientific names of the salamanders represent is the genus and species. The first part of the name (genus) symbolizes one group and the second part (species) symbolizes the other group. Salamanders are a group of amphibians normally categorized by their lizard-like look, with slim forms, rounded noses, and the existence of a tail in adults and larvae. All existing salamander groups are known by the the scientific name Urodela.

The scientific names of salamanders include the genus and species. For example, in Ensatina eschscholtzii, 'Ensatina' is the genus, while 'eschscholtzii' is the species.

The scientific names of salamanders represent two main groupings in biological classification: the genus and species. For instance, in the scientific name Ensatina eschscholtzii, 'Ensatina' refers to the genus, while 'eschscholtzii' specifies the species. This naming convention is part of the Linnaean classification system which helps in precisely identifying and categorizing living organisms.

Salamanders belong to the order Urodela, which also includes newts. Both salamanders and newts retain their tails as adults and have similar body structures adapted for walking and swimming.

The straight tubules or tubuli recti in the testis lead into a network of fine tubules known as the rete testes, which then connects to the efferent ductules. From these structures, sperm cells eventually reach the epididymis where they mature.

The straight tubules in the testis, also known as tubuli recti, serve as a transitional conduit from the seminiferous tubules, where sperm are formed, to a network of delicate tubules known as the rete testes. Formed sperm cells move from the lumen of the seminiferous tubules into the straight tubules, and then into the rete testes. Beyond this, the sperm make their way to the efferent ductules and then exit the testis to move towards the epididymis, where they further mature before ejaculation.

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The collecting tubule cells' permeability to water increases as a result of increase in the production of adh (b).

The cell is the basic unit of life. Every living thing is made up of trillion of cells. Cell carry out all the vital processes of the body.

Thus, the option (b) is the correct option.

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Allergic contact dermatitis is a type IV hypersensitivity reaction, which is a delayed-type cell-mediated immune response, for example, seen in contact with latex or nickel, and not associated with antibody involvement like in type II hypersensitivity such as hemolytic disease of the newborn.

Allergic contact dermatitis is an inflammation of the skin resulting from a type IV hypersensitivity reaction to an allergen or irritant. This type of hypersensitivity is also known as delayed-type hypersensitivity because it takes a few days for symptoms to develop after exposure. For example, when an individual comes into contact with latex or nickel, which they have been previously sensitized to, it can cause a red and swollen area on the skin. Notably, type IV hypersensitivity reactions do not involve antibody responses, but are rather T-cell mediated responses.

There are various examples of type IV hypersensitivity, and contact dermatitis, such as from exposure to latex or plants like poison ivy, is among them. It's worth noting that in the case of poison ivy, many severe symptoms are due to the plant's toxic oils rather than the T cell-mediated response. To differentiate, hemolytic disease of the newborn, for example, is not a type IV hypersensitivity reaction but rather an example of type II hypersensitivity because it involves the destruction of blood cells due to the mother's antibodies attacking the baby's red blood cells.

A hurricane hits a small island, killing all but a few members of a bird population. This is an example of population bottleneck effect. The bottleneck effect is a sudden and high reduction of a population's genetic pool due to environmental actions (such as flood) or human activities.

Viral proteins is produced in a bacterial cell soon after viral RNA appears in the cell

Explanation:

The virus which infects the bacteria is called as bactriophage. When the bactreiophage attaches the bacteria, it releases its RNA into the bacterial cells. As the viral RNA enters the host cell which is nothing but the bacteria, it initiates to replicate due to which proteins are synthesized.

Thus the first product which is produced in a bacterial cell soon after viral RNA is protein. As the protein are made other metabolic process starts and fully developed viruses are synthesized.