A box is sliding at constant velocity. The coefficient of friction between the box and the surface is 0.27. The push force on the box 25000N. what is the weight of the box

The astronauts  had to eat dried food because they didn't know when their food was going to spoil or when they would get more. Its like living of a weeks worth of  groceries for a few months. It took the station a long time to send food because of all the light years ( how many years it takes light to go through space) it takes to get to the space ship with hungry astronauts.

Option D is the correct answer.

The 1930s Dust Bowl in the Great Plains was caused by- poor farming practices. These practices resulted in erosion and loss of topsoil majorly affecting the crops.

Answer: The correct answer is -

C) phylogeny

Explanation:

Phylogeny can be described as the evolutionary development of a taxonomic group of organisms or it describes the evolutionary history of a particular species.

It can be represented through phylogenetic tree (also known as tree of life) that depicts the evolutionary relationships between different species.

Thus, option C) is the right answer.

The evolutionary history of a species is called its phylogeny.

(Option C)

Phylogeny is the study of the evolutionary relationships among organisms and the tracing of their lineage back through time.

The primary tool used in phylogenetic analysis is the phylogenetic tree, also known as a phylogeny.

This tree is a branching diagram that represents the hypothetical evolutionary relationships between species or groups of organisms.

Phylogenetic trees are constructed using various sources of information, including;

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B. From nucleic acids to amino acids

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Answer:An arthropod (/ˈɑːrθrəpɒd/, from Ancient Greek ἄρθρον (arthron) 'joint', and πούς (pous) 'foot' (gen. ποδός)) is an invertebrate animal having an exoskeleton, a segmented body, and paired jointed appendages. Arthropods form the phylum Euarthropoda, which includes insects, arachnids, myriapods, and crustaceans.

Explanation:

Tall buildings require steel framing due to its high strength and ductility, essential for supporting large structures and enduring significant forces without collapsing

Although steel is not completely rust-resistant and requires protection against corrosion, especially in moist and corrosive climates, this material is fundamental in the construction of high-rise buildings. The use of steel, along with reinforced concrete, began the era of the skyscraper that continues to influence modern architecture. Reinforced concrete is made by pouring concrete around a grid of steel rods or rebar to increase its tensile strength. This combination enables buildings to withstand significant forces, such as those from earthquakes, without collapsing while retaining their structural integrity. Moreover, steel can be added to older buildings to reinforce and ensure their structural stability.

The independent variable is the variable we have full control over or we could manipulate. Thus, from among the choices below:

A. the amount of pressure placed on the rock B. the type of minerals used to form the rock C. the number of rocks tested D. the chemical composition of individual minerals

The answer is A. (the amount of pressure placed on the rock). It is the independent variable.

Answer:

Gradually cool a gas and record its change in state

Explanation:

The experiment that the student should perform to study the effect of removing thermal energy from a system is to gradually cool a gas and record its change in state. When a gas is cooled, it loses thermal energy, causing its particles to slow down and come closer together. This can cause the gas to condense into a liquid or even freeze into a solid, depending on the conditions. Hence option D is correct.

Thermal energy refers to the energy that is generated by the movement of particles in a substance. It is a type of internal energy that is related to the temperature of a substance. The more thermal energy that a substance has, the more its particles move, and the higher its temperature.

Closing a circuit by adding a penny or nail and recording if the bulb glows does not involve removing thermal energy from a system. It is a simple experiment to test whether a circuit is complete or not and does not relate to thermal energy.

Gradually warming a liquid and recording its change in the state also does not involve removing thermal energy from a system. It involves adding thermal energy to the liquid, causing it to gain energy and potentially change from a solid to a liquid or from a liquid to a gas.

Hence option D is correct.

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Light excites photosystems in chlorophyll, carbon dioxide is fixed to yield carbohydrates, and water is used to supply electrons.

The reactions of photosynthesis are divided into 2:

During light-dependent reactions, light energy excites electrons in the photosystem of chlorophyll molecules leading to the liberation of electrons.  Electrons generated from the splitting of water molecules fill the space left by the liberated electrons from the photosystem.

The products of light-dependent reactions are used to fix carbon dioxide into carbohydrates in light-independent or dark reactions.

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Answer:

The answer is endoplasmic reticulum.

Explanation:

The endoplasmic reticulum is a sort of organelle found in eukaryotic cells that frames an interconnected system of smoothed, film encased sacs or tube-like structures known as cisternae. The layers of the ER are ceaseless with the external atomic film. Another organelle in the cell is the endoplasmic reticulum. While the capacity of the core is to go about as the phone mind, the ER capacities as an assembling and bundling framework. It works intimately with the Golgi mechanical assembly, ribososmes, mRNA, and tRNA.

Answer:

Telomere

Explanation:

Chromosomes that gained its name from Chroma and Soma from Greek words is made up of protein and a single molecules of (DNA)deoxyribonucleic acid refers to thread-like structure that is found in the nucleus of cells(plant and animal). It contains specific instructions that is responsible for creature been unique

Telomeres serves as protection for the chromosomes. They are stretches of DNA that is found at the ends of linear chromosomes.

Whenever a cell divides they usually lose a bit of their DNA, and once all the telomere DNA is gone the cell will die and their won't be replication of cells.

Telomeres helps in preventing cancer in such a way that the telomere of the chromosomes of malignant cells is not allow to get lose and this prevent the uncontrolled growth of cancer which can be dangerous.

Therefore, the chromosome part that might be involved with processes such as aging and cancer is TELOMERE.

A subcontinent is a large landmass that is part of a continent. Therefore, the correct option is A.

A subcontinent is a large, distinct landmass that is a part of a larger continent. It is usually separated from the rest of the continent by geographical features such as mountains, rivers, or oceans.

A subcontinent often has a unique cultural, historical, and ecological identity and may contain several countries or regions. The Indian subcontinent, for example, is a large landmass that includes India, Pakistan, Bangladesh, Nepal, Bhutan, and Sri Lanka. It is separated from the rest of Asia by the Himalayan mountains and is characterized by a shared history, diverse religions, and a rich cultural heritage. Therefore, the correct option is A.

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The offspring of a cross between a red chicken and a white chicken may exhibit a mixture of the two colors, possibly resulting in a speckled or blended phenotype, suggesting codominance or incomplete dominance in their genetic traits.

The question is about predicting the appearance of offspring from a red chicken and a white chicken. To determine the phenotype of offspring in genetics, it's necessary to consider the dominant and recessive traits of the parents. In a situation depicted by a similar example of chickens with black and white feathers, the resulting first generation (F1) offspring were all black with white speckles, suggesting that the speckled pattern is a result of codominance or incomplete dominance.

If we apply this to the cross of red and white chickens, one might expect the offspring to display a mixture of the two colors, possibly resulting in a speckled or blended phenotype, should the same genetics principles apply. However, the exact outcome can vary depending on specific genetic mechanisms at play, such as codominance or incomplete dominance. Without more information about the genetic basis of the colors in these chickens, a precise prediction isn't possible.

The introduction of predator species generally affects the stability of the ecosystem by gradually declining the overall diversity in that region.

An ecosystem may be defined as the place or an area where individuals of different species live together and interact with one another for the purpose of food, shelter, and space.

When a predator species is significantly introduced in any ecosystem, it will definitely reduce the population of prey in that region. Due to this, it becomes very tough for the prey species to survive in that ecosystem.

As a result of this prey species either die off or leave that ecosystem and migrate to other places. As soon the level of prey species declines, it will remarkably affect the population of predator species as well. After some time, the population of predators also decreases gradually.

Therefore, the introduction of predator species generally affects the stability of the ecosystem by gradually declining the overall diversity in that region.

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If you explore two continental plates at a convergent boundary, you will most likely observe earthquakes, faults, and mountains.

Continental plates, also known as tectonic plates, are large, rigid sections of the Earth's lithosphere, which is the outermost layer of the Earth's surface. These plates are made up of continental crust and the underlying uppermost portion of the mantle. The Earth's lithosphere is broken into several distinct plates that float and move atop the underlying asthenosphere, which is a more ductile and fluid layer.

The continental plates are characterized by containing continental crust, which is thicker and less dense compared to the oceanic crust found beneath the oceans. These plates cover the Earth's landmasses, including continents and continental shelves. The movement of these plates, driven by the convective currents in the underlying mantle, is responsible for various geological phenomena such as earthquakes, mountain formation, and the creation of different types of plate boundaries, including convergent, divergent, and transform boundaries.

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Answer is Decomposers

In any food chain autotrophs are producers which is makes food with the help of sun energy. Primary consumers are herbivores which eat plants, and secondary and tertiary consumers are carnivores which feed on primary consumers. On the death of producers and consumers, decomposers such as bacteria and fungi, breakdown dead animal, dead plant materials and waste products from other members of the ecosystem into simple soluble nutrients. These nutrients return to the soil from dead organic matter. Thus, the living things depends on decomposition processes at the end of the chain by decomposers.