The lymph system is a network of small vessels and organs that includes _____.

Final answer:

Organisms require nitrogen to synthesize amino acids, the building blocks of proteins, not carbohydrates. Nitrogen fixation by microorganisms converts atmospheric nitrogen into forms usable by plants, which animals then consume, making it a critical component of the nitrogen cycle.

Explanation:

The original statement that all organisms require nitrogen to make amino acids, which in turn are used to build carbohydrates, contains an error. In fact, organisms use nitrogen to synthesize amino acids, which are the building blocks of proteins, rather than carbohydrates. Atmospheric nitrogen (N2), which makes up about 79% of Earth's atmosphere, cannot be utilized directly by most organisms. Through a process called nitrogen fixation, certain microorganisms convert atmospheric nitrogen into forms that plants can absorb, such as nitrate ions (NO3−) and ammonium ions (NH4+). Once assimilated by plants, these nitrogen compounds can be incorporated into amino acids and eventually proteins. Animals obtain their nitrogen by consuming plants or other animals. The cycling of nitrogen between the atmosphere, soil, plants, and animals is an integral part of the nitrogen cycle, which is crucial for life on Earth.

DNA and RNA nucleotides differ in their sugar molecules, DNA has deoxyribose while RNA has ribose. DNA is double-stranded while RNA is single-stranded. DNA has thymine as one of its bases while RNA has uracil.

The structure of a DNA nucleotide and an RNA nucleotide differ in several ways. Both DNA and RNA nucleotides have three components: a sugar molecule, a phosphate group, and a nitrogenous base. However, the sugar molecule in DNA is deoxyribose, while in RNA it is ribose. Additionally, RNA is single-stranded, while DNA is double-stranded. Finally, the nitrogenous bases in DNA are adenine, guanine, cytosine, and thymine, while in RNA, thymine is replaced by uracil.

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Evolution

                                                                                                             .................................................                                                                          

Answer:

Sensation

Explanation:

A P E X

Answer:

Physical Hazard

Explanation:

An hazard is defined as something or a substance that by itself or due to its interaction or combination with another substance has the potential to cause harm.

We have 3 types of hazards.

a. Physical Hazard: This has to do with substances such as: uncovered light bulbs

b. Chemical Hazard: This has to do with chemical substances e.g. Acids, Bases, Pesticides, radioactive substances, e.t.c.

c. Biological Hazard: For example microorganisms such as Viruses, Bacteria and Fungi

Uncovered light bulbs may expose foods to physical hazard such as if the light bulbs get shattered , the presence of broken light bulb shards in food is very harmful.

Answer:

Option B

Explanation:

Both plants and animals can reproduce asexually, therefore option A is incorrect

Organisms that reproduce sexually have the advantage to produce genetically diverse offspring. Hence, option C is incorrect

Heterotrophs can reproduce both sexually and asexually, hence there is not no relation between being heterotroph and reproducing either asexually or sexually. Hence option D is also incorrect

If an organism reproduces asexually, then there is no pressure on it to select its mate. Hence, option B is correct

It changes one amino acid in the genetic code if a change in one nitrogen base occurs because one triplet codon is responsible to make one amino acid.

DNA is the genetic material that stores information about the organism, this information is first converted into RNA by the process of transcription. After the transcription, this information is converted into the amino acid sequence.

Genetic code is the triplet sequence of a nitrogen base, which codes for the protein if any base is changed with another base, it will change the amino acid. Amino acid is made by triplet code, three bases are responsible for one amino acid.

Therefore, one amino acid is affected by a change in one nitrogen base, due to a triplet genetic codon.

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Answer:

C) About 10 percent of the desert tortoise's energy transfers to the coyote.

Explanation:

In the given food web, the coyote is the top consumer that feeds on desert tortoise and kangaroo rat. Only 10% of the energy of one trophic level is passed to the next trophic level and 90 % of the energy is lost in respiration.

Hence, only 10% energy of desert tortoise would be delivered to coyote and rest would be lost during respiration.

Final answer:

The Calvin cycle uses ATP and NADPH, which contain energy from sunlight, to turn carbon dioxide into carbohydrates, such as glucose, for long-term energy storage.

Explanation:

The energy for the Calvin cycle is derived primarily from ATP and NADPH, which are compounds rich in chemical energy. These molecules are produced during the light-dependent reactions of photosynthesis.

The ATP and NADPH, carrying energy captured from sunlight, are utilized by the Calvin cycle to convert carbon dioxide into carbohydrate molecules, such as glucose, which serve as long-term energy storage for the cell. Specifically, the Calvin cycle harnesses the energy in the form of 6 ATP and 6 NADPH to produce Glyceraldehyde-3-phosphate (GA3P) molecules that will eventually form the backbone of carbon atoms for carbohydrates, primarily glucose. Thus, the Calvin cycle effectively converts the short-lived energy stored in ATP and NADPH into a more stable form of energy in carbohydrates, a process essential for life on Earth.

Final answer:

The most desirable shape for larger cells is one that maximizes surface area to volume ratio for efficient exchange of nutrients and waste, often a sphere. Various cell shapes can also result from functional requirements or physical constraints influencing cellular function.

Explanation:

The most desirable shape for larger cells would be one that maximizes the surface area to volume ratio, to ensure efficient exchange of nutrients and waste. Cells that are too large may not be able to support the rate of diffusion required for their volume due to a decreased surface area-to-volume ratio. Spherical shapes tend to be the most efficient in terms of surface area-to-volume ratio because as the cell increases in size, a sphere's surface area increases as the square of its radius, while its volume increases as the cube of its radius.

Considering two cells, a spherical cell with a diameter of 5 µm would likely exchange nutrients and wastes more efficiently than a cubed-shaped cell with a side length of 7µm. The surface area-to-volume ratio for a sphere is higher than that of a cube, resulting in shorter distances for nutrients and wastes to travel to and from the cell's periphery, leading to faster molecular exchange rates.

Cell shapes can also be affected by physical forces and functional requirements. For example, red blood cells adopt a biconcave disc shape to optimize the exchange of oxygen, whereas nerve cells have long extensions to aid in signal transmission. Thus, while most cells approximate a sphere for efficiency, different shapes can arise from the cell's necessity to fulfill specific roles within an organism.

Final answer:

Groundwater can both remove and deposit mineral material, depending on its flow and the surrounding materials.

Explanation:

Groundwater can both remove and deposit mineral material through various processes. When groundwater flows through porous materials like sand and gravel, it can erode and dissolve minerals, carrying them away. This is how groundwater can remove mineral material. On the other hand, when the flow of groundwater slows down or stops, the minerals it carries can precipitate out and get deposited in the pores or fissures of the surrounding materials. This is how groundwater can deposit mineral material.

selective cutting is the answer hope this helps you

The "pyloric sphincter" which located between the stomach and the duodenum.

The movement of food from the stomach into the esophagus is controlled by the pyloric sphincter at its base.

The beginning of the small intestine would be the duodenum. The duodenum's primary function is to finish the first stage of digestion. Food first from the stomach has been combined with pancreatic enzymes and gallbladder bile in this area of the intestine. Bile as well as the enzymes aid in food digestion.

The smooth muscle ring known as the pyloric sphincter separates the small intestine from the stomach. It opens and shuts to regulate the movement of stomach juices as well as partially digested food first from the pylorus towards the duodenum.

Therefore, the "pyloric sphincter" which located between the stomach and the duodenum.

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The dendrite of a neuron receives signals and sends them to the cell body. The signals then move through the axon to the axon terminal, which transmits the signal to other neurons. The axon hillock is where the axon connects to the cell body and where signal transmission begins.

The part of a neuron that receives signals and sends a message to the cell body is called the dendrite. Each neuron has many dendrites, which are designed to receive chemical signals from other neurons and transmit these signals to the cell body. The signals then move further down the neuron through the axon, reaching the axon terminal, which is responsible for transmitting the signal to the next neuron.

The axon hillock is also an important part of this process as it is the area where the axon connects to the cell body and where the initiation of signal transmission to other neurons begins.

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