What is a defining feature of mammals that is not present in most other vertebrates?


A. Mammals reproduce through internal fertilization.


B. Mammals maintain a constant body temperature.


C. Mammals can produce milk for their offspring.


D. Mammals have a nervous system with a spinal cord.

Answer:

The correct answer is c. the truck driver.

Any object is said to be the motion if its relative distance with respect to a reference point is keep on changing.

For example, a kid travelling through a train might seem to be stationary with respect to the seat. However, he would seem to be moving if we see him in respect to the railway track outside the train.

A reference point is anything (place, person or any object) used to determine if something or someone is in motion.

In the given situation, the distance between truck driver and bulldozer will remain the same throughout the journey as it is being placed on the back of the truck. Hence, the correct answer is truck driver.

The reference point where the bulldozer does not appear to be moving is:

According to the given question, we can see that there is a bulldozer which is moving at a speed of 50km/h to the back of a flatbed truck.

As a result of this, we can see that the truck driver is in front of the bulldozer and as the object is in motion, then the reference point would keep changing.

The reason why the reference point of the driver would appear to be stationary is that he is placed at the back of the truck.

Therefore, the correct answer is option C

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This would be because of the melting of icebergs, ice is made of fresh water, that means the water increases in freshness because of the increasing amount of ice melting. It is getting warmer most likely because of global warming, which also contributes to the melting of glaciers

Answer:

This would be because of the melting of icebergs, ice is made of fresh water, that means the water increases in freshness because of the increasing amount of ice melting. It is getting warmer most likely because of global warming, which also contributes to the melting of glaciers

The mouse population increases. Snakes eat mice, so fewer snakes would mean more mice.

b.the mouse population increases  

You can only make one zygote but in some cases the egg splits and makes an identical twin.

Final answer:

A couple can potentially produce over 64 trillion unique zygotes due to the combination of meiotic genetic recombination, random fertilization, and occasional occurrences of twins, both dizygotic and monozygotic.

Explanation:

The number of unique zygotes that a couple can produce is astonishingly high due to the genetic variability involved in sexual reproduction. Each human zygote contains a unique set of 46 chromosomes, with 23 inherited from each parent. This genetic diversity arises from the process of meiosis during gamete formation, where chromosomes are shuffled and recombined. Additionally, random fertilization further increases genetic variability.

While most often a single egg is released and fertilized, resulting in a unique zygote for each pregnancy, there are cases such as dizygotic twins where two eggs are released and fertilized by two different sperm, resulting in two genetically distinct zygotes. Furthermore, unique scenarios can lead to monozygotic twins, where a single zygote divides to form genetically identical offspring. However, when considering the number of potential unique children a couple can produce without considering twins, the estimated number of genetically unique zygotes is over 64 trillion, showcasing the vast potential for genetic diversity.

Polygenic traits are controlled by two or more than two genes (usually by many different genes) at different loci on different chromosomes. These genes are described as polygenes . A polygene refers to a group of genes that when expressed together produce a particular phenotype or trait.

Answer:

letter b

Explanation:

Question 1

This is a fascinating topic. Tectonic plates can be thought of something that is an enlarged form of a kitchen plate. When two of these huge plates meet, one forces another to go lower into the earth's mantle (a below surface geologic location made of rocks and molten (soupy or liquid) rocks.

This process of one plate forcing another to go lower is called subduction.   The rocks grind away on each other. They are subjected to 6 different forces, the most common of which are friction, compression and folding. Add heat and you get metamorphic rock. It's like a kitchen recipe but on a much bigger scale.  That's the cook's tour of Metamorphic rock.

Question 2

Mechanical weathering is a process similar to what is written above. If the sea pounds against the shore, eventually the rock will break down. Where I live, if water gets into a rock's cracks, when it freezes and the ice expands it will eventually break the rock apart.  In short, big rocks become little pebbles.

Chemical weathering: water and minerals combine to react with the minerals contained in rocks. I'm not well versed in this area, so I'm not sure I could give you a good example other than this one. One of the biproducts of refining oil is sulfur dioxide, especially with Alberta oil which is very "heavy" and tar like. This combines with water to produce H2SO3 which is not an extremely strong acid, but it is still an acid. It can react with the minerals in a rock and you have the break down of a rock.

Answer:

FOR HIGH POWER: CELL MEMBRANE & NUCLEUS

LOW POWER: CELL MEMBRANE

Explanation:

The organelles observable under high power are the cell membrane, nucleus, and ribosomes.

The organelles that were observable under high power are the cell membrane, nucleus, and ribosomes. Vacuoles cannot be observed under high power because they are too small to be seen with a light microscope.

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Wells access groundwater, which is part of the water cycle's groundwater storage stage. They must be deep enough to reach the aquifers and are sometimes used with observation wells to monitor aquifer health. Pumping water creates a cone of depression around the well, which allows water to flow towards it.

A well is a structure created to access water from beneath the Earth's surface, tapping into what we call groundwater. The water obtained through wells is part of the water cycle, specifically from the groundwater storage stage. When a well is dug or drilled, it reaches into aquifers, which are the underground layers of water-bearing rock or materials such as gravel, sand, silt, or clay. Groundwater contained in these aquifers is replenished by precipitation that infiltrates the ground, a process known as recharge.

To maintain a reliable water supply and monitor the health of an aquifer, wells may be used in conjunction with observation wells. These are important for observing short-term and long-term changes in water levels, which might indicate the health status of an aquifer. Wells are essential in areas without natural springs, as they provide a means of extracting water that otherwise would remain inaccessible within the geosphere.

While drilling, wells might pass through various aquifers and must be cased to prevent leakage and contamination. Pumping water from the well creates a cone of depression in the water table around the well, which allows water from the surrounding aquifer to flow towards the pump. Excessive pumping, however, can cause nearby wells to run dry or deplete the aquifer, especially during periods of prolonged drought or overuse.

Answer:

groundwater

Explanation:

When precipitation becomes groundwater, wells take the water stored in the ground and utilize it in the well space.

Galileo could be considered the father of modern science for several reasons:

1. Development of the scientific method: Galileo's work laid the foundation for the scientific method, which is still used today. He emphasized the importance of conducting experiments and making observations to test hypotheses, rather than relying solely on philosophical or religious beliefs.

2. Advancement of astronomy: Galileo made significant discoveries in the field of astronomy. By using a telescope to observe celestial bodies, he provided evidence to support the heliocentric model of the solar system proposed by Copernicus. His observations of the moons of Jupiter and the phases of Venus challenged the prevailing geocentric view.

3. Promotion of empirical evidence: Galileo emphasized the importance of empirical evidence in scientific inquiry. He advocated for the use of experimentation and observation to gather data and draw conclusions. This approach shifted the focus from relying solely on theoretical reasoning to actively testing hypotheses.

4. Popularization of scientific ideas: Galileo's works, such as "Dialogue Concerning the Two Chief World Systems," played a significant role in popularizing scientific ideas among the general public. By writing in Italian instead of Latin, he made scientific knowledge more accessible to a wider audience, which helped to spread scientific thinking and knowledge.

5. Influence on future scientists: Galileo's contributions to science inspired future generations of scientists. His methods and ideas influenced notable figures like Isaac Newton, who built upon Galileo's work to develop the laws of motion and universal gravitation.

In summary, Galileo's role in developing the scientific method, advancing astronomy, promoting empirical evidence, popularizing scientific ideas, and inspiring future scientists make him a key figure in the emergence of modern science.

Water is H2o

Covalent compound (O,H are nonmetals)

Valence of O (O must form an octet): 6

Valence of H: 1

Total valence electrons: 8

Molar mass: 18.02 g/mol

hope this helps good luck

Answer:

D. Drink water from plastic bottles.

Explanation:

Was on USATestPrep

each parent supplies one half of the ( chromosomes)

A trait is a feature or quality of an organism. All organisms have a unique set of traits that they inherit from their parents. Each parent supplies one half of the chromosomes needed.

Each person inherits 23 chromosomes from each parent and get the other from the next parent.

The answer is true.

A) True

To avoid these hazards, technicians must turn off the engine to stop CNG flow – especially before working on the vehicle. Most CNG vehicles have several ways of turning off the engine, so check the manufacturer's specific directions. Automatic release valve - installed on newer CNG systems.

Answer: True

Explanation:

CNG vehicles present potential hazards which include:

• Ignition sources as the ignition temperature is twice as high as gasoline.

• Contact with fuel

• Asphyxiation

• High-pressure CNG line

To avoid any of these hazards, you must turn off the engine to stop CNG flow and there are many ways by which you can turn it off.  

Animals excrete water by respiration and by passing urine.

The type of bonding responsible is Hydrogen Bonding

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This energy most directly results from the life activity of  respiration.

The hummingbirds have very high energy expenditure (have the highest oxygen requirements of all vertebrae) with a fast heart rate, very fast wing beats and sustained hovering. So the hummingbird is nearly always on the edge of starvation, needing to take in more nectar than its body weight each day.

The respiratory system of these birds is highly adapted for the high oxygen needs. So, the muscles of the hummingbird cause pressure changes within the air sacs. As a result, more oxygen can enter the respiratory system. Also, they have the highest density of red blood cells which allows them to rise heart beat to around 500 breaths per minute during flight.

Answer: Cellular respiration

Explanation:

The process by which the living organism derive energy for the various metabolic processes of the body is known as cellular respiration.

This process allows the body to obtain energy from the food that they eat. Humming bird usually feeds on the nectar of flowers as a source of energy.

The cellular respiration is the process by which this food will be transformed into adenosine triphosphate which is a high energy molecule required for various processes of the body.

Answer:

2. Creating products that improves people's lives.

5. Remaining impartial about data while conducting experiment.

Explanation:

Scientists are required to perform ethical practices during their tenure of research which does not include any bias, manipulation in observations and the research product can be used for the wellness of the society.

Among the options given, the following are correct options:

2. Creating products that improves people's lives.: The ethical practice of research should aim to provide benefit to the society rather than sceintists obtaining their own benefit.

5. Remaining impartial about data while conducting experiment.: Manipulated and biased observations should not be included in the data used for obtaining and describing the results. It is against the research ethics.

Correct answer: Mantle

Earth is composed of three layer called as crust, mantle,core. Crust is the outer layer of the earth and mantle is the middle layer and core is known as the inner layer of the earth surface.

Mantle is a layer which found in between the crust and core, it is made up of silicate rocky shell with a thickness of 2886 kilometers. It covers the 84% of the earth's volume.

The mantle layer of earth encompasses core layer of the earth which is made up of iron and nickel which covers 15% of the earth's volume. Mantle layer of the earth trap the heat which is being generated inside the core layer of the earth and act as a insulator.

Earlier in the passage this question was provided for, you should be able to find the fallowing text: "The mantle, being made of rock, acts as a very effective insulator."

Answer: Mantle

A. Populations with high levels of genetic diversity are more likely to have individuals with traits that help them survive if conditions change.

Populations with high levels of genetic diversity are more likely to have individuals with traits that help them survive if conditions change. The correct option is A.

The range of different inherited traits within a species is referred to as genetic diversity.

There probably be various individuals with a wide range of different traits in a species with high genetic diversity. For a population to adapt to changing environments, genetic diversity is essential.

Genetic diversity allows populations to adapt to changing environments. More variation increases the likelihood that some individuals in a population will have allele variations that are suited to the environment.

Those people are more likely to survive and have children with that allele.

Individuals with traits that help them survive if conditions change are more likely to exist in populations with high levels of genetic diversity.

Thus, the correct option is A.

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Functional magnetic resonance imaging (fMRI) is the neuromarketing technique that looks for active areas in the brain by measuring the amount of oxygenated blood flowing through the body.

Functional magnetic resonance imaging (fMRI) is a noninvasive technique for measuring the activities of the brain. This technique is used to observe the brain’s functional anatomy as it reveals the parts of the brain that are involved in a certain mental process. fMRI functions by using magnetic resonance imaging to measure the small changes in blood oxygenation and flow that take place as a result of activities of nerve cells in the active areas of the brain.

Answer:

The correct answer would be - whisk fern that belongs to the phylum psilophyta.

Explanation:

The whisk fern belongs to the division psilophyta. It is the lower vascular fern or primitive fern. It has vascular tissue or water conducting tissue but they lack true leaves and roots.

The water mineral absorption occurs or initiates in the root like stem called rhizome. Photosynthesis process takes place in the aerial part of the plant. Rhizome receives water from fungus through a mycorrhizal association.

Thus, the correct answer is option C.

Answer: B. Amount of matter produced by the producers should be more than that of the consumers.

Food web defines a interconnection between different food chains and transfer of energy at each trophic level. According to the ten percent law 10% energy is lost from each trophic level. At the first trophic  level there are producers. Producers occupy the only one level in the trophic levels the rest is occupied by consumers this shows the category of consumer is more than producer. Therefore, for successful food web food availability should be more at initial trophic level hence amount of matter produced by the producers should be more than that of the consumer.

Amount of matter produced by the producers should be more than that of the consumers because matter and energy are lost with each successive step of the food chain. Therefore, for a food web to be functional and successful, the total amount matter produced by the producers be more than that of the consumers they support.

A. A disease in the population of rabbits. The rabbits dying off would mean that the grass population would increase because there are less rabbits to eat it. The snake and hawk population drop because they are both predators of rabbits, meaning that they eat rabbits. Since the rabbits are dying off, the snakes and hawks have less food source so the limit on how many snakes and hawks that can be sustained by eating the rabbits decreases.

Its C i did the test im sure