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If immigration and emigration numbers are equal, the decrease in birth rate results in slowed growth rate.

If the resources in a population become less available, the population reaches the carrying capacity.

When the exponential phase of logistic growth curve of a population ceases, the population growth begins to slow down.

When food as grain is harvested, the population of mice in a farming area increases.

Further Explanation:

Immigration is the process when individuals come from outside a place to inhabit there. The population increases due to immigration. Emigration is the process when individuals move out of a place to inhabit somewhere else. Emigration decreases the population. When immigration number is equal to emigration number, no change in population occurs due to these two processes. The slow down the growth rate of a population is because of the decrease in birth rate.

Once the resources are less obtainable, the population reaches the carrying capacity. A cut down within the population growth and further stop is observed because of the restricted resources obtainable in a specific space. the restricted range of entities that a population will support is known as the carrying capacity or the size of the population at that the expansion stops because of restricted resources is known as the population's carrying capacity.

A logistic growth curve is an s-shaped (sigmoidal) curve that is quicker within the center growth period, and slowly at the highest, leveling off at a maximum worth after some amount of time. The initial section of the curve is exponential; the speed of growth accelerates as it approaches the center of the curve. At the center (K/2), the expansion rate begins to decelerate but continues to grow until it reaches an asymptote, K that's termed the "Carrying Capacity" for the environment. This type of curve is typically accustomed model biological growth patterns where there is an initial exponential growth quantity followed by a leveling off as a lot of the population is infected or as the food supply or another issue limits further growth.

Once the grain is harvested there's a lot of food obtainable for the mice as well. So, during this case, the population will increase automatically, and that is why they have a tendency to settle in these areas.

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Answer Details:

Grade: High School

Subject: Biology

Chapter: Ecology

Keywords:

Immigration, emigration, birth rate, death rate, growth rate, resources, population, entities, individuals, logistic growth, exponential phase, mice, grain harvested, farming area.

Answer:

1. C

2. Letter B

3. C

4. C

5. B

100%

Explanation:

Answer;

b. Their ability to pass on genetic information.

Explanation;

-Protobionts are systems that are considered to have possibly been the precursors to prokaryotic cells. A protobiont is an aggregate of abiotically produced organic molecules surrounded by a membrane or a membrane-like structure.

-They exhibit some of the properties associated with life, including simple reproduction, metabolism and excitability, as well as the maintenance of an internal chemical environment different from that of their surroundings.

Answer:

There is a difference between seeing and perceiving and you need different thing to make both actions

Explanation:

Seeing is the act of just see. Perceiving is how your brain makes sense of the picture you just saw.

For seeing you need light, your eyes (full with cells that capture different wavelengths of light) and an object that reflects that light. For example, there is an object that you see that is red, nearly circular, it has some volume and has some yellow marks. All you see is that.

Now, what you need to perceive this object is a brain with a neural connection to your eyes. You perceive this object like an apple and at the moment you see it you know it is nearly circular, has two colors that you call red and yellow, that has something you have learned is called volume and that all these descriptions are consistent with your knowledge of an apple.

Explanation:

Activation energy is defined as the minimum amount of energy necessary to initiate a chemical reaction.

Protein molecules that function like a catalyst are known as enzymes. Enzymes help in carrying a biochemical reaction without itself getting consumed.

Enzymes bind at the specific site of a substrate and helps in lowering the activation energy so that, more and more reactant molecules can participate in the reaction. As a result, formation of products become more rapid.

Activation energy is the energy needed to initiate a chemical reaction. Enzymes lower activation energy, making reactions occur faster.

Reactants must overcome an energy barrier to generate products, hence activation energy is the least energy needed for a chemical reaction. Breaking and rearranging chemical bonds during reaction creates this energy barrier.

Enzymes speed up biological chemical reactions. They do this by lowering reaction activation energy. Enzymes allow reactant molecules to reach the transition state and create products by providing a reduced activation energy pathway.

Enzymes form enzyme-substrate complexes by attaching to reactant molecules at their active sites. This interaction stabilises the transition state and aids bond breaking and product production. The enzyme releases the products and remains unaltered to catalyse other reactions. Enzymes accelerate biological reactions and maintain life's complex metabolic pathways by lowering activation energy.

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Answer:

D. In both commensalism and parasitism, organisms live in close physical proximity and one benefits from the interaction. However, only in parasitism is one organism harmed

Explanation:

Parasitism: is a relationship between two organisms where one is usually harmed and the other gets benefits from the relationship. (Whale lice on a right whale)

Commensalism: an association between two organisms in which one benefits and the other derives neither benefit nor harm. (A remora on a lemon shark)

A snowflake has six points. Due to the peculiar chemical makeup of water and the way snowflakes develop, this hexagonal shape is produced.

Thus, an ice crystal is created when atmospheric water vapor condenses and solidifies around a dust particle. Water molecules organize themselves into a hexagonal lattice as the crystal expands. The overall form of the snowflake is determined by this pattern.

The crystal often displays six symmetrical arms or points as it grows branches and complex patterns. It's crucial to remember that not all snowflakes are completely symmetrical, and differences might happen as a result of the temperature and humidity levels present at the time of production.

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A. by building highways, railways, and airports

C.by providing power and Internet connections

D.by importing or developing innovative technologies

Physical capital applies to circumstances of production that subsist in a material way and could participate in the improvement of the effectiveness of commercial operation which is conducted out by the nation. Although the development of substantial training and the enhancement of food nutrition could be deemed as an expenditure,  However, it does not directly involve in the expansion of the physical capital.

Answer:

A. by building highways, railways, and airports

C.by providing power and Internet connections

D.by importing or developing innovative technologies

The motion scheme of conscious motion is Impulse -> receptors / senses -> sensory nerves -> brain -> motor nerves -> effectors / muscles.

the nervous system is one part of the coordination system that regulates the body's activities through rapid electrical stimulation. Components of the nervous system consist of nerve cells (neurons), the central nervous system, and the peripheral nervous system.

Nerve Cell Structure (neurons)

There are 7 parts of the structure of nerve cells that need to be known:

1. Dendrites are relatively short, branched cytoplasmic lines and function to receive stimuli to be sent to the cell body.

2. Perikarion, in this cell body stimuli that were previously sent, begins processing.

3. Axon is a long cytoplasmic outline and serves to deliver excitatory. Axon length of about 1mm-1m. The first end of the axon is called the hillock axon, while the end end of the axon is called the terminal axon.

4. Schwann cells are supporting nerve cells in the form of fat which functions to produce myelin sheath.

5. Myelin sheath is a part of the nerve that functions to protect axons and provide nutrients.

6. Ranvier nodes, which play an important role in accelerating the delivery of stimuli.

7. Synapses are the link between one neuron and another neuron. Also, synapses act as a meeting point between the axon ends of one neuron and the dendrites of other neurons or connections to muscles and glands.

Based on its shape, nerve cells are divided into Multipolar Nerves, Bipolar Nerves, and Unipolar Nerves. Multipolar nerves have one axon and two dendrites, but they can also be more. Examples are in the motor nerves in the brain and spinal cord. Whereas the Bipolar Nerve has two lines consisting of dendrites and axons, such as ear, eye, and nose receptors. Unipolar nerves are bipolar neurons that have only one outstretched cell body because their axons and dendrites are fused. Examples of unipolar nerves are neurons in the embryo and photoreceptors of the eye.

Stimulation or impulses are messages received by the receptors or the body from the outside environment, then carried by neurons or a series of electrical pulses that circulate nerve fibers. Examples of impulses include changes in temperature, pressure, odor, aroma, sound, objects, and various flavors such as salty, sweet, sour, and bitter. Impulses received by the receptor and delivered to the effector can then cause movement. movement can be divided into two types, namely conscious motion, and reflex motion. Unconscious motion is a movement that occurs as a result of deliberate or conscious. For example the movement of holding a book when you want to study, or when picking up a pencil. While reflex motion is involuntary or unconscious motion.

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Details

Grade: High School

Subject: Biology

keywords: the nervous system, stimulation or impulses

Answer:

The correct answer is option A, Photoreceptors

Explanation:

Photoreceptors basically function by changing their color when exposed to light. In human body photoreceptors are  found in the eyes. When light strike on the photoreceptors, electrical signals are generated which are sent to the brain through the optic nerves. Human eye has two types of photoreceptors- Rods and Cones. Rods detect light sensation while cones detect the color.  

In answering the question, the neurons that detect light stimuli are photoreceptors. They are found in the retina of the eye and convert light energy into electrical signals, aiding in the perception of vision. They differ from other receptors like olfactory, chemoreceptors, and mechanoreceptors.

The neurons that detect light stimuli are photoreceptors. These specialized cells are located in the retina of the eye and are responsible for converting light energy into electrical signals that can be interpreted by the brain. This process is essential for the sense of vision.

There are two main types of photoreceptors - rods, which are used for detecting light intensity and making vision possible in low light conditions, and cones, which are used for color perception.

They are different from olfactory receptors, which are involved in the detection of smell, chemoreceptors that detect chemical stimuli, and mechanoreceptors that sense mechanical stress or strain such as pressure or vibration.

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Answer:

The correct answer is option C. anaphase.

Explanation:

Anaphase is the process that separates the replicated or duplicated chromosomes present in the nucleus of a parent cell into 2 identical daughter cells.

The chromatids are separated by the mitotic spindle structure. The sister chromatids are separated together at their centromeres. Then separated chromatids are pulled by the spindle to different poles of the cell.

If nondisjunction takes place during anaphase of meiosis then this means that one pair of sister chromatids did not separate which results in 2 cells that have an extra copy of one chromosome and 2 cells that are lacking that chromosome.

A trisomy genetic diseases in males is Klinefelter syndrome caused by the availability of 1 or more X chromosomes.

Thus, the correct answer is option C.

Answer:

B. Viruses cannot replicate by themselves.

Explanation:

Viruses cannot replicate on their own, they need a host. Viruses do not have cells, they are only made up of nucleic acid and proteins. Viruses are defined as an infectious particle that replicates when it infects a host cell and uses its machinery to create more viruses.

Viruses require a host cell for replication, while bacteria are complete cells capable of independent reproduction. The correct option is B: Viruses cannot replicate by themselves.

Viruses are microscopic infectious agents that are composed of genetic material (DNA or RNA) enclosed in a protein coat called a capsid. They are considered to be on the borderline between living and non-living entities.

Thus, the correct option is B.

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Starch is a polymer made up of glucose monomer units. When consumed, starch is broken down into glucose, which is used as an energy source.

Starch is a polymer composed of these glucose units linked together through a process called polymerization. When consumed by an organism, the starch is broken down into its monomer glucose components, which are then used as an energy source.

Therefore, among the choices presented, amino acids, fatty acids, glucose, and nucleotides, the correct answer is glucose.

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Answer:

C It moves in an orbit around Jupiter.

Explanation:

A moon is a natural satellite of some planet and is recognized as the star that circulates around a main planet, that is, does not orbit around a star, that is, to be considered moon, the star must move in a orbit around a planet. Some moons are larger than some major planets, such as Ganymede and Titan, natural satellites of Jupiter and Saturn, respectively, which are larger than Mercury. Thus, if the orbit of these moons were around the Sun, they could be considered as planets, but their orbits are around the planet Jupiter or Saturn, so they are considered moons.

Answer: Option A  

Explanation:

The immune system of the body is made of a variety of cells. The cells producing antibodies "remembers" the infection caused inside the body and helps in providing immunity against it for a very longer duration of time..

The T-cells of the immune system remembers the viruses and contains a number of phagocytotic cells which helps in proving immunity. T- cells also activates B-cells.

So, if the Number of T-cells drastically reduces in number, then the body will be more susceptible to infection.

The answer is B. As tectonic plate move, the climate on the continent change (though ever so unperceptively slowly) due to changes in latitude. This change in the environment requires that species of both plants and animals adapt to the new climate. The selection pressures of natural selection will act upon the variations in the population and the best adaptable features will be conserved (while unfavorable traits will be slowly stymied over genrations) in the population hence the genotype and phenotype of the population will gradually change.  

Urban sprawl is not caused by deforestation; instead, it is related to the expansion of human populations into low-density areas. Deforestation leads to soil erosion, increased atmospheric CO2 levels, and loss of wildlife habitats.

The environmental problem that is NOT caused by deforestation is urban sprawl. Urban sprawl refers to the expansion of human populations away from central urban areas into low-density, monofunctional and usually car-dependent communities. Deforestation, in contrast, can lead to issues such as soil erosion, an increase in atmospheric CO2 levels, and the reduction of wildlife habitat. These issues arise as trees, which prevent soil erosion, absorb CO2 and provide habitats for many species, are removed. Urban sprawl is more directly related to population growth and the desire for more space and resources, rather than the specific act of deforesting areas.

Answer: Metaphase I

During metaphase I homologous chromosomes get arrange in the center of the cell. In metaphase I  pair homologous chromosome line up between the two poles of the cell form the metaphase plate. The spindle fiber microtubule attach at the kinetochore proteins of the centromere of each chromosome.  

Answer:

Metaphase I  is the correct answer.

Explanation:

Metaphase I phase of meiosis are tetrads of homologous pairs lined up along the center of the cell and attached to the spindle fibers.

Meiosis is a type of cell division where chromosome number gets reduced by half and it produces four haploid cells.

meiosis comprises the steps of meiosis I and meiosis II

In the metaphase I the tetrads align themselves at the metaphase plate whereas, in metaphase II chromosomes align up separately along by the metaphase plate.

Anaphase I chromosomes separate and in Anaphase II sister chromatids of every chromosome get separated and they move towards the opposing poles.

Thus the correct answer is Metaphase I.

Answer:

Embryo

Explanation:

The embryonic stage starts at the beginning of third week. Before this, the stage of  fertilized egg is known as blastocyst. Once the embryonic stage is reached, the cell of blastocyst become distinct and starts dividing to form human being. Thus, after the 15th day of development the growing cell mass is referred to as embryo.  The embryonic stage continues till the 8th week. By the start of 9th week , the growing cell mass converts into a fetus and this stage continues till the birth of child.

Answer:

D-10,000

Explanation:

Answer:

The correct answer would be c.)reduction

Oxidation and reduction occur when transfer of electrons takes place from one element or atom to another.

The atom which receives or gains electron is said to be reduced while the atom which looses an electron is said to be oxidized.

For example, in cellular respiration oxygen gains electrons and H⁺ ions and is converted into water which is released as the byproduct of the process.

1/2 O₂ + 2 e⁻ + 2 H⁺ → 2H₂O

Homeostasis is the body's process of maintaining equilibrium and stability within its internal environment in response to changes in external and internal conditions, keeping things like body temperature and blood glucose levels within narrow and specific ranges.

The phrase that best describes homeostasis is the 'maintenance of equilibrium' in a living organism. Homeostasis refers to the body's ability to keep its internal environment stable, regardless of external changes. This is achieved through a dynamic balance between various body systems, all working towards a set point. It involves a series of adjustments and reactions to internal and external stimuli to maintain parameters such as body temperature, glucose levels, etc. within a narrow range. For instance, if the body becomes too warm, it will trigger a response to cool down, and if the blood glucose level increases after a meal, the body will regulate it by moving the glucose into cells that need it or storing it for later use.

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Answer:

C. a stop codon is reached.

Explanation:

Translation is the process by which proteins are synthesised from mRNA. It ends in the termination stage when a stop codon is encountered. Normally during translation the A-site of ribosome is responsible for binding the complementary codon on the mRNA with the incoming tRNA. The tRNA with the polypeptide chain is hold by the P-site.

During termination, a stop codon ( UAA, UGA or UAG) is encountered by the A site in ribosome and is then recognised by release factors. Release factors enter the P site and fit there leading to disassembly of entire ribosome/mRNA complex. A water molecule is added to the last amino acid of the chain which separates it from the tRNA molecule and leads to its release.

The four phases of cell cycles are:

The cell cycle is a process of which completed in four stages. The process starts from the growth of the cell to the division of the cell into an identical daughter cell.

The four stages of the cell, are complete with creating another new cell. The stage of mitosis is also a multistep process after the three phases, which leads to the multiplication of the cell.

The steps of mitosis are:

Prophase: the cell starts for division, nucleus wall breaks down.

Metaphase: spindle fiber starts to form.

Anaphase: the sister chromatids begin to separate.

Telophase: the division is almost done in the last step.

Thus, there are four stages of cell cycles which are in order following:

(G1) gap stage, (S) synthesis stage(G), gap 2 stage, and Mitosis, or M stage: also known as mitosis, is the division of the cell into identical daughter cells.

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