Answer:
The correct answer is d. an ecotone
Explanation:
An ecotone is the area of transition between two different biomes so ecotone is the boundary between two different habitats. In this area, two different communities meet with each other for example estuary are water bodies that are found at the place where streams of rivers meet the sea.
Therefore at estuary two ecosystems and their community meet with each other and the transition of river in sea occurs in this area. So estuary is transition phase of fresh water biome to salt water biome therefore the right is d. an ecotone.
Final answer:
An estuary is an ecotone, a biome where fresh water from rivers mixes with salt water from the ocean, creating a unique, nutrient-rich environment that supports a variety of marine life.
Explanation:
An estuary is an ecotone, d. An estuary is a biome where a source of fresh water, commonly a river, meets the ocean, resulting in both fresh water and salt water mixing. This mixture yields diluted, brackish saltwater. Because of the continual mixing of these waters, estuaries are not characterized by deep water. Instead, they provide biologically productive and protected areas where many young offspring of various marine species, including crustaceans, mollusks, and fish, start their lives. The salinity in estuaries plays a significant role, fluctuating with the inflow of fresh water and the coming and going of tides, which influences the adaptations and types of organisms that can thrive here. Estuaries are neither solely freshwater biomes nor are they areas with low concentrations of minerals and nutrients; in fact, they are often nutrient-rich.
What makes science different from other ways of study? A. Only science has theories B. Science is based on evidence 3. Science is based on art D. Only science studies only supernatural events
Final answer:
Science is different from other ways of study because it is based on evidence and is limited to what can be observed and measured. It involves testing new ideas with experiments and observations, making its conclusions reliable and factual. So the correct option is B.
Explanation:
Science is different from other ways of study because it is based on evidence and logic. Science distinguishes itself by its systematic approach to gaining knowledge about the natural world through the use of observations, reasoning, and repeated testing. This process starts with a question, which scientists attempt to answer with empirical evidence and sound reasoning.
Unlike other fields of inquiry, science deals only with things that can be observed and measured. Phenomena such as supernatural beings or events are beyond the scope of science because they cannot be observed or tested with current scientific methods. Furthermore, science is continually evolving, as its ideas are open to revision and must withstand rigorous scrutiny and experimental verification.
In contrast to other disciplines that might rely on subjective interpretation or untestable beliefs, science requires that any new ideas be testable by experiments or observations. This makes its conclusions reliable and objective. As such, areas of knowledge like morality, aesthetics, or spirituality are considered beyond the realm of scientific inquiry. They are part of what is often termed 'nonscientific' or 'metaphysical' realms.
The transmission electron microscope is most useful for
1. looking at the surface features of a virus
2. seeing animal tissue that is visible to the naked eye
3. studying the structures of a live paramecium
4. viewing a cell’s mitochondria in detail ...?
1. looking at the surface features of a virus
Explanation;Electron microscopes are types of microscopes that uses a beam of electrons instead of light to magnify objects up to 500,000 times the actual size. These microscopes have a higher resolving power than the light microscopes since they use electrons.There are two types of electron microscopes ; that is Scanning Electron Microscope and Transmission Electron Microscope. Transmission electron microscope are used for studying internal structures of cells. In these microscopes electromagnets are used to magnify the image by passing a beam of electrons through a thin specimen.Answer:
A looking at the surface features of a virus.
Explanation:
Which law best describes why the planets are pulled toward the Sun and orbit it?
Answer:
The right answer to this question is: Newton's first law, the Law of Motion.
Explanation:
This law describes why the planets are pulled toward the sun in a very simple way. Every body in motion will continue like that, until another one interfers this process.
But in this process, we need to remember that the sun is very big, and bigger the body, bigger the gravity to pull the bodies around it towards it. The sun is very big, and this is how the planets keep moving around it.
Which of the following best describes how crossing over occurs during meiosis?
A. During prophase I, homologous chromosomes are lined up and pulled apart to opposite poles.
B. During prophase I, segments of chromatids are exchanged between homologous chromosomes.
C. During prophase II, chromosomes overlap and sections of each chromosome switch places.
D. During prophase II, sister chromatids trade places with each other before metaphase begins.
Crossing over occurs during the Prophase I stage of meiosis, where segments of chromatids are exchanged between homologous chromosomes, generating genetic diversity. The correct option is option b.
The process of crossing over occurs during meiosis, specifically in Prophase I.
This stage is crucial for creating genetic diversity. Option 'B' captures this best: During prophase I, segments of chromatids are exchanged between homologous chromosomes.
During this exchange, similar sections of DNA on these chromosomes swap places,
leading to the creation of new gene combinations which ultimately increase genetic diversity in offspring.
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Proteins serve a variety of functions in living organisms. Which of the following protein-containing substances plays a role in defense?
choices:
muscles
hair
antibodies
hormones
Answer:
hair
Explanation:
Answer:
A. Muscles
I've got it right on Study Island.
Explanation:
Mitosis produces which cell type?haploiddiploidchromosomegamete
Mitosis produces diploid cells, which are identical to the parent cell. These cells are crucial for growth, repair of tissues, and asexual reproduction. In contrast, meiosis creates haploid cells or gametes needed for sexual reproduction.
Mitosis is a process of cell division that produces two identical daughter cells from a single cell, each maintaining the diploid state of the parent cell. In other words, through mitosis, a cell divides into two cells, each with the same number of chromosomes as the original cell. This process allows for growth, repair of tissues, and asexual reproduction in organisms.
On the contrary, meiosis is a type of cell division that results in four daughter cells, each with half the number of chromosomes of the original cell. These are known as haploid cells which are often referred to as gametes or sex cells. These cells are essential for sexual reproduction because when two gametes combine during fertilization, they restore the diploid state.
Summing up, mitosis produces diploid cells whereas meiosis generates haploid cells.
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Population growth is limited by density-dependent factors such as _____.
predation and disease
volcanoes and earthquakes
droughts and floods
biotic and abiotic factors
The correct answer is predation and disease.
Density dependent factors are those factors, which are directly influenced by the density of a population. These factors directly influence the size and the growth of the population.
The predation and the disease are density dependent factors, as predation of a small density population would cause a significant decrease in number, so, predation is the limiting factor for the growth of the population. Same for diseases, the disease can affect most of the members of the population, and limiting its growth.
The changes in the environment and the natural calamities are density independent factor.
During the cell cycle,
A) DNA is replicated once before mitosis and again before cytokinesis.
B) DNA is replicated during mitosis.
C) DNA is replicated before mitosis begins.
D) DNA is replicated directly after the completion of mitosis.
Answer:
dna is replicated before mitosis begins
Explanation:
DNA replication occurs during the S phase of interphase, prior to the onset of mitosis, to ensure each daughter cell has an identical set of genetic information. So the correct option is C.
Explanation:During the cell cycle, DNA is replicated before mitosis begins. This critical process of replication occurs in the Synthesis phase, or S phase, of the cell cycle, during interphase. The purpose of this replication is to ensure that each daughter cell produced after cell division will have an identical copy of the DNA, preserving the cell's genetic information.
Observations through autoradiographs indicate that none of the cells in mitosis were radioactively labeled, confirming that DNA replication does not occur during mitosis but rather beforehand. It's essential for DNA to be copied during interphase so that, during the mitotic phase, which includes mitosis and cytokinesis, each resulting daughter cell contains the same genetic content as the parent cell.
Therefore, the correct answer to the question of when DNA is replicated during the cell cycle is:
C) DNA is replicated before mitosis begins.
What is an organism’s niche?
Answer:
Part of a animals adaption to help it survive
Explanation:
Where does aerobic respiration take place in prokaryotes?
Aerobic respiration in prokaryotes occurs in the cell membrane, as they lack mitochondria. Not all prokaryotes use aerobic respiration; some are anaerobic or facultatively anaerobic, adjusting their metabolic process according to the presence of oxygen.
Aerobic respiration in prokaryotes, which includes bacteria and archaea, takes place in the cell membrane as they lack the organelles found in eukaryotes. Unlike eukaryotes, where aerobic respiration occurs in the mitochondria, prokaryotes carry out this process on their cell membrane since they do not possess membrane-bound organelles. It's important to note that not all prokaryotes are capable of aerobic respiration; some are strictly anaerobic or can switch between aerobic and anaerobic metabolism (facultative anaerobes). However, for those prokaryotes that do engage in aerobic respiration, the cell membrane is the site where the electron transport chain is located, and where ATP is generated by oxidizing nutrients using oxygen as the final electron acceptor.
During a spring tide, which phases could the Moon be in? Select all that apply. A. full B. new C. first quarter D. third quarter
Which statement about the cell membrane is true?
A.It contains cellulose and sugars that are involved in communication.
B.It is present in animal cells only.
C.It is rigid and elastic for supporting the cell’s shape.
D.It prevents harmful substances from entering a cell.
Answer:
Option D
Explanation:
All cells including that of plants, animals, microorganisms such as bacteria, fungi, algae etc. consists of cell membrane. In-fact some of the internal cell organelles are also bound by membrane.
Cell membrane is made up of phospholipid bi-layers which consist of two essential components – a) proteins and b) Phospholipids.
This membrane is semi –permeable which means they can allow few substances to pass through it while restricts the passage of others.
Hence, it protects the cell from harmful substance in its surrounding.
Thus, option D is correct.
Thus, option D is correct.
what part of a phospholipids is charged or polar
Which piece of bubble gum blows the biggest bubble?
The average size bubble blown using Dubble Bubble bubble gum was 3.7 inches. Hubba Bubba's average bubble was 3.3 inches, Bazooka's was 3 inches. Bubblicious had an average bubble of 2.7 inches and Bubble Yum was close behind with an average bubble of 2.6 inches.
So if you want to blow a big bubble Dubble Bubble bubble gum is the gum for you
What are the four reasons why cells divide
Cells divide for growth of an organism, repair of damaged tissues, maintenance of healthy tissues, and regulation to prevent the propagation of damaged cells due to accumulated mutations.
Cell division is a critical process in all living organisms, and it occurs for several fundamental reasons that are essential for life. Here are four reasons why cells divide:
Growth: From the development of an embryo to an adult organism, repeated cell division allows for the continuous growth of the organism. A single fertilized egg, or zygote, divides multiple times to produce the vast number of cells required to form a mature multicellular organism.Repair: Cell division is necessary to repair damaged tissues, such as healing a cut on the skin. It allows for the replacement of damaged or worn-out cells, ensuring optimal function of tissues and organs.Maintenance: Even after an organism has fully grown, cell division continues to replace old and worn-out cells to maintain healthy tissue function.Mutation Regulation: Cells are programmed to divide a certain number of times. Accumulation of mutations can damage DNA, and cell division is regulated to prevent propagation of damaged cells.In summary, cell division is a key biological process that allows for growth, repair, maintenance, and the regulation of cell lifecycle, ensuring the health and sustainability of life.
Where is oxygen content in a river or stream likely to be highest?
As blood is filtered in the excretory system, which of the following functions like a recycling center?
A.the bladder
B.Bowman's capsule
C.tubules in the kidney
D.ureters between the kidney and the bladder
Answer: C. tubules in the kidney
The chief function of kidney is the production of urine. Kidney is the excretory system of the body. The blood being filtered by the glomerulus of the nephron reaches to the renal tubule in order to reabsorb water, glucose, nutrients and ions such as sodium. All these components are reabsorbed back into the blood. Therefore, tubules in the kidney functions like a recycling center as they allow the reabsorption and reuse of valuable components before they are excreted out along with urine.
The plasma membrane, according to the fluid-mosaic model is composed mainly of What and Proteins
Birds have hollow bones. explain how this is adaptive.
The diagram shows the stages of the eukaryotic cell cycle.
Which stage is labeled E in the diagram?
mitosis
interphase
S phase
G0 phase
The right answer is interphase.
In both eukaryotic and prokaryotic cells, the interphase is the period of the cell cycle that is characterized by an increase in cell volume, the cell transcribes its genes and the chromosomes are duplicated. It can be subdivided into several phases:
* phase G1 (growth or gap), during which the cell grows and performs the functions for which it is programmed genetically: biosynthesis of proteins, etc. It is during this phase that the young, freshly divided daughter cells grow to their final size.
* phase S (of the English synthesis, because of the synthesis of new DNA molecules), during which the chromosomal material is doubled by DNA replication. This is called chromosome duplication.
* phase G2, where the cell prepares to divide into two daughter cells. At the end of this phase, each chromosome is perfectly identical to its homolog in terms of morphology and from the point of view of the genes present, but each gene is not necessarily identical to its homologue, since generally several alleles exist.
** There is also the G0 phase, which is one of reproductive senescence. It is a possible exit from the control point at the end of G1, an alternative to the continuation of the G1 phase and the transition to the S phase. The G0 phase can be temporary or permanent and it is often induced by unfavorable conditions.
Answer:
The correct answer would be interphase.
The cell cycle is mainly divided into two phases: mitosis (M) and interphase.
Interphase is the phase in which a cell spends most of its time. It is the phase of growth and DNA replication.
It can be sub-divided into three stages:
Gap 1 (G₁) phase which is represented by letter A in the given diagram. Synthesis (S) phase in which DNA replication takes place. It is represented by letter B in the given diagram. Gap 2 (G₂) phase which is represented by letter C in the given diagram.Letter D represents mitosis (M) phase in which the actual division of the cell takes place.
explain why the ptolemaic theory seems logical based on daily observations of the rising and setting sun. ...?
when a person loses consciousness due to head injury what keeps the body functioning
Answer:
Autonomous nervous system
Explanation:
When a person is unconscious due to head injury, but the autonomous nervous system of the body keeps the body function normal by ensuring the flow of information between the brain and the rest of the body part.
The autonomous nervous system is the part of the nervous system of the body that is not controlled by our will but it works in the background in order to make sure that the body functions normally during an emergency.
What allows humans to have different traits from each other?
A. They have different numbers of chromosomes.
B. They have different genes.
C. They store DNA in different places.
D. They have different haploid numbers.
B. They have different genes.
Which of the following two cycles are the most closely related in their role in sustaining life?
a.
carbon and nitrogen
b.
water and nitrogen
c.
carbon and oxygen
d.
nitrogen and phosphorus
Which physical factors MOST influence a marine biome?
A) tides, oxygen, costal hotel development
B) sunlight, fishing boats, whale population
C) wave motion, salinity, atmospheric pressure
D) plankton, water temperature, sand composition
Deep-ocean lantern fish have special organs that use chemical energy to produce light. However, the light can only travel a certain distance through the water before it is no longer visible. How does this phenomenon validate the Law of Conservation of Energy?
The fish is a closed system, so energy is allowed to exit the system.
The Law of Conservation of Energy applies to biological, not physical, systems.
The light energy travels through the water until it is reflected or absorbed.
The light is not carried by matter and contains no energy.
Answer:
The correct answer is that the light energy travels through the water until it is reflected or absorbed.
Explanation:
The law of conservation of energy is illustrated as the form of energy that cannot be destroyed or produced, however, it gets transformed from one form to another. In case of Deep Ocean lantern fish that generates light in water, which travels along certain distance and then moves back, that is, in the reverse direction. This happens as the light travels in waves and when it comes in contact with the waves, it either gets absorbed or is reflected back.
Food chains and webs not only describe the order organisms are eaten, but they also describe the _____.
a. flow of energy in an ecosystem.
b. importance of the ecosystem.
c. health of the ecosystem.
d. animals that are all related.
The average corn yield per acre has _______ during the last forty years.
The average corn yield per acre has doubled during the last forty years.
corn yields are coming in anywhere from 130 bushels per acre (bu/acre) to 260 bu/acre, as an stadistic data.
Which of the following describe(s) the role of cytotoxic T cells in the specific immune response?
I. They kill cancer cells.
II. They kill cells infected by viruses.
III. They interact with MHC-I molecules
A.II only
B.II and III only
C.I and II only
D.I and III only
E.I, II, and III
Answer: Option E is the correct answer
Explanation:
T cells are part of the adaptive immune system and have a large repertoire of receptors that allow their activation or inhibition. T lymphocytes or T cells have the ability to recognize and lyse (kill) infected or transformed cells; these transform cells could include cancer or tumor cells. This recognition is due to the contact of the T cell receptors (principally the T cell receptor) with the Major Histocompatibility Complex molecule I (also known as MHC I). When cells are infected or are transformed, the expression of these MHC I molecules are altered, and therefore it is detected by T cells as something “abnormal” and therefore release molecules that cause cell death, such as perforin, granzymes, IFN-γ and the Tumor Necrosis Factor-α. Therefore, T cells can kill cancer or infected cells and interact with MHC-I molecules.
During diffusion molecules move in what type of motion
it moves from higher to lower concentration