Two students are planning an experiment that will test how planaria (aquatic flatworms) respond to different environments. They will conduct two investigations—one that tests the worms’ responses to different water temperatures and one that tests the worms’ responses to different levels of acidity. Student 1 wants to buy two groups of flatworms and use a different group for each investigation. Student 2 thinks the same group of worms should be used for both investigations. Do you think either student’s method would give more accurate results? Why or why not? Explain your response.
Student 1’s methods would be more accurate, because the student would control more factors. Only one variable at a time (either temperature or acidity) would be tested on each group of worms. On the other hand, Student 2 is testing both factors on all the worms, which could make the results unclear.
Student 1 is taking different groups of worms, so his result will be more accurate, because the same group of worms may show the same or more related result.
What is a flatworm?Flatworms came under phylum platyhelminths.
They are unsegmented, bilateral, and soft bodied organism.
In the given experiment, the student 2 is taking the same group of flatworm, which may have some same characteristics and response to stimuli.
The result can be not ideal.
The student 1 is taking different groups of flatworm.
It will show correct and distinctive result.
Thus, student 1 will show accurate result.
Learn more about Planaria
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Cell-mediated immunity differs from humoral immunity in that _____. view available hint(s) cell-mediated immunity differs from humoral immunity in that _____. they respond differently to invaders cell-mediated immunity is longer lasting a humoral response is mounted more quickly a subsequent secondary immune response can occur in humoral immunity clonal selection occurs only in cell-mediated immunity
Cell-mediated immunity involves T cells attacking infected cells, while humoral immunity involves B cells and antibodies targeting extracellular pathogens. Humoral immunity has memory cells for quicker secondary responses.
Explanation:Cell-mediated immunity differs from humoral immunity in that it involves T cells which directly attack and destroy infected or cancerous cells within the body. This type of immunity focuses on intracellular pathogens that have already entered cells. The humoral immune response primarily involves B cells and the production of antibodies to target pathogens in extracellular spaces, such as the bloodstream and lymph system. Unlike cell-mediated immunity, humoral immunity features memory cells that can promptly respond to subsequent exposures to the same pathogen. Notably, both types of immunity can have long-lasting protective effects, but they employ different mechanisms and have different response times.
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What challenges did the United States face during Reconstruction?
very little supplies and dept i hope this is right
If diagnosed with cancer what foods increase the spread of cancer
What would happen to owls if the grass was sprayed with an insecticide?
Keep in mind the owls eat the mice that eat the insects that eat the grass
Sweetened beverages supply nearly half of all the added sugars consumed by americans. true or false
A major oil spill has just happened in a near-shore environment. What prediction could be made as to why an oil spill in this area would be much more dangerous to marine life than one in the open ocean?
Answer:
An oil spill happening near the shore would be more dangerous because now not only is aquatic life in danger so are humans, in the sense of them swimming in the oil and possibly ingesting it. which would cause poisoning and could potentially lead to death.
Explanation:
The two processes that determine the world's current biodiversity are
Final answer:
Biodiversity is shaped by two key evolutionary processes: speciation, which creates new species, and extinction, which removes species. The balance and fluctuations between these processes determine the rise and fall of biodiversity levels over time.
Explanation:
The two evolutionary processes that determine the world's current biodiversity are speciation and extinction. These processes serve as the 'birth' and 'death' of species, contributing to the dynamic nature of biodiversity throughout geological time. When the rate of speciation exceeds that of extinction, biodiversity increases, and conversely, it decreases when extinction rates are higher. These fluctuations are evident from the fossil record and have led to dramatic changes in biodiversity over Earth's history.
Which statement best distinguishes meiosis from mitosis?
A. Meiosis replicates then separate genetic information.
B. Meiosis combines the genetic information of egg and sperm
C. Meiosis maintains the cell’s original chromosome number.
D. Meiosis reduces the cell’s original chromosome number by half.
Animals with chitinous exoskeletons and jointed appendages are classified as
Which drug is used as a rescue from toxicity of methotrexate?
The process of photosynthesis plants use to create food and where does it occur
Two species of antelope ground squirrels are separated by the grand canyon. they are hypothesized to descend from a common ancestor, populations of which were separated as the canyon formed. if this hypothesis is correct, it would be an example of: sympatric speciation by vicariance. sympatric speciation by dispersal. peripatric speciation by vicariance. allopatric speciation by vicariance. allopatric speciation by dispersal.
Answer:
Allopatric speciation by vicariance.
Explanation:
Allopatric speciation by vicaria occurs when two populations of a species are separated by a geographical barrier. This geographical barrier, which can be a gorge, for example, as shown in the question above. This barrier causes a spatial separation. In this case, we say that a geographic isolation has occurred.
When these populations separate, they may come under different pressures as they are in different areas. These pressures, over time, lead to genetic divergence and, consequently, possible reproductive isolation. Many consider this kind of speciation as the main model of speciation.
__________ result from antibody binding to the rbc surface and removal of a portion of the membrane by macrophages; this occurs in immune hemolytic anemia (iha), which is most commonly recognized in dogs.
Who gave the brain its name
Which of these choices is a drawback of the clean water act ?
A. It targets point sources pollution
B. It targets non point source pollution
C. It excludes agriculture runoff
D. It excludes lakes rivers and streams
Answer:
the answer is C
Explanation:
A client is admitted to an acute care facility with complications of celiac disease. which question should be helpful initially in obtaining information for the nursing care plan?
People with central-body obesity are more likely to develop _____ than people who do not have excess fat in the midsection of their bodies.
a. beriberi
b. iron-deficiency anemia
c. elevated hdl cholesterol
d. type 2 diabetes
If one species is split into two populations in two different places, natural selection may drive them to become two different species. how?
What types of structures allow animals to obtain (ingest) food?
The way animals eat their food totally depends on the food they are going to ingest. Carnivores have sharp claws to grip tightly into flesh and have sharp teeth to sheer off pieces of meat. Birds use their beak while the amphibians eat their food by trapping small insects and flies by their long sticky coiled tongue. Snakes inject venom by its two sharp teeth called fangs. And spider injects venom only to paralyze their prey. Some animals like jellyfish use tentacles to trap their prey. Poriferans like sponges take in food through the pores.
The picture shows the transport of sodium and potassium ions.The picture shows an Na+/K+ ATPase pump. What is a CORRECT interpretation of the picture? A) The picture shows a passive transport of sodium and potassium ions. B) Potassium ions are moved out of the cell and sodium ions are moved in. C) The energy for the action of the pump is released by the utilization of ATP. D) The binding of the Na+ ions changes the conformation of the lipid bilayer.
What organic molecules must be included in the soil for earthworm nutrition?
The organic molecules that must be included in the soil for earthworm nutrition are Neutral pH. A neutral pH substance that is neither basic nor acidic is considered neutral. The pH scale is the one that measures how a substance is basic or acidic. It ranges from 0-14. A 7 pH is neutral.
At the neutral pH the molar densities of chemical elements, the Hydroxide and Hydronium are equal. Therefore the object is not a base or not an acid as well. Although if an object isn't acidic or basic is usually called neutral. The neutral pH effectiveness makes it an equal concentration of chemical elements ions which is pure water in a simple form.
Which of these organelles is present in both prokaryotic cells and eukaryotic cells?
Ribosomes are organelles present in both prokaryotic and eukaryotic cells. They are essential for protein synthesis. Unlike other organelles, ribosomes can function without a membrane, making them universal across all cell types.
The correct answer to the question about which organelle is present in both prokaryotic cells and eukaryotic cells is the ribosome. Ribosomes are essential for protein synthesis and are found in both prokaryotic and eukaryotic cells. While eukaryotic cells contain membrane-bound organelles like the nucleus and mitochondria, prokaryotic cells do not. However, both types of cells share the presence of ribosomes for translating mRNA into proteins.
Here are the important points to remember:
Nucleus: Only in eukaryotesMitochondrion: Only in eukaryotesVacuole: Typically in plant and fungal cells, not in prokaryotesRibosomes: Present in both prokaryotes and eukaryotesRibosomes are not surrounded by a membrane and function as the site of protein synthesis, essentially translating genetic information into functional proteins. This makes them a universal and crucial component of all living cells, regardless of whether they are prokaryotic or eukaryotic.
Many clinicians diagnose disorders by using criteria listed in the
Alcohol abuse may result in wernicke-korsakoff syndrome, which is characterized by the inability to learn from experience and
Alcohol abuse may result in wernicke-korsakoff syndrome, which is characterized by the inability to learn from experience and custodial care in some cases. Wernicke-Korsakoff syndrome (WKS) is a type of brain disorder and a combination of two separate conditions (Wernicke’s disease and Korsakoff syndrome) that occurs at the same time. Alcoholism is the most common cause of WKS. Other causes include lack of vitamin B-1, or thiamine.
Suckling sends neural feedback to the hypothalamus which responds by releasing the hormone, oxytocin, from the posterior pituitary gland. oxytocin, informally dubbed "the love hormone", promotes both maternal bonding and stimulation of smooth muscle-type contraction in the mammary glands. these contractions compress the milk-filled ducts to expel their contents through the only available opening, the nipple. oxytocin is responsible for milk release, but which hormone stimulates milk production?
What would be a major sign of overtraining? change in appetite decrease performance loss of motivation and vigor disturbed sleep?
Answer: decrease performance
By overtraining, we mean doing more work than what is physically tolerated. Change in appetite, decrease performance, loss of motivation and vigor, and disturbed sleep are among the symptoms of overtraining. Among the four, the major sign of overtraining is decrease performance.
Polarity of bonds and molecules is determined by the ______________ of the atoms involved.
Explanation:
Polarity is defined as the formation of opposite charges on the atoms of a compound due to the difference in their electronegativities.
For example, in a HCl molecule chlorine is more electronegative in nature as compared to the hydrogen atom.
Hence, chlorine will attract the valence electron of hydrogen atom more towards itself. Due to this a partial positive charge will develop on hydrogen atom and a partial negative charge will develop on the chlorine atom.
Thus, we can conclude that polarity of bonds and molecules is determined by the difference in electronegativity of the atoms involved.
earths biosphere is
Vessel that transports deoxygenated blood from lower parts of the body returns to the right atrium via the