The answer is A i know you got this already it's 2019 now.
in 2004 a fossil of an organism that had fins and gills but also lungs and wrists was discovered what might the fossil suggest about evolution
The 2004 fossil discovery of Tiktaalik roseae, exhibits traits suggesting an evolutionary transition from aquatic to terrestrial life, supporting the theory of evolution. This 'tetrapod-like fish' shows a progression towards air-breathing and land movement, highlighting the importance of such fossils in understanding evolutionary transitions.
Explanation:The discovery of a fossil possessing features of both fish and tetrapod, such as possessing fins and gills as well as lungs and wrists, suggests a key evolutionary transition. This is likely an ancestor of amphibious animals that represents a metabolic and morphological transition from aquatic to terrestrial life. The creature is the Tiktaalik roseae, a "tetrapod-like fish,” which exhibits morphological traits between a sarcopterygian fish, with its feet-like fins, and early tetrapods, with true limbs.
This fossil is significant as it provides evidence of the vertebrates' transition from aquatic to terrestrial life, supporting the theory of evolution. For example, despite having gills for aquatic respiration, it also had lungs, showing the transition towards air-breathing organisms. Additionally, the connected fin bones suggest they might bear weight, hinting at the evolution towards limbs utilized for moving on land. Therefore, fossils such as Tiktaalik roseae play a critical role in understanding the complexities and transitions within the evolutionary process.
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Which of these glands secretes releasing hormones? which of these glands secretes releasing hormones? hypothalamus adrenal cortex thymus ovaries testes?
A part of the brain called the hypothalamus releases the hormone. Therefore, the correct option is A.
Specific hormones are released from the pituitary gland when these hormones reach the anterior pituitary gland and trigger its release. Gonadotropin-releasing hormone (GnRH), growth hormone-releasing hormone (GHRH), thyrotropin-releasing hormone (TRH), and corticotropin-releasing hormone (CRH) are among the hormones that the hypothalamus releases.
These releasing hormones are essential for controlling the pituitary gland's hormone release, which in turn affects many bodily activities. The thymus, ovaries, testes, and adrenal cortex do not directly release hormones.
Therefore, the correct option is A.
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Your question is incomplete, most probably the complete question is:
Which of these glands secretes releasing hormones? which of these glands secretes releasing hormones?
hypothalamus adrenal cortex thymus ovaries testesTrue or False? (will medal/fan)
An immune system that does not function properly could prevent an animal from maintaining homeostasis by allowing the animal to become sick.,
Explain how trees can be produced and yet the smallest trophies level in a pyramid of numbers
MUST ANSWER BOTH TO GET FULL POINTS!!
What is the function of the structure identified by the red arrow?
A) Food capture
B) Mobility
C) DNA transfer
D) Protection
2. What morphology is represented in the picture?
A) filamentous
B) cocci
C)rod-shaped q
D)spirilla
The correct answer is option D which is protection.
Explanation:The structure shown by red arrows is the outer membrane of the cell.Its function is to protect the cell from the outer environment by controlling the transport of materials in to and out to the cell.While for movement, there are pili or cilia, which are also used for food capture and DNA transfer.Pili are outward projections from outer membrane.Part 2.Answer:The correct option is D which is spirilla shape.
Explanation:In the picture, there is long wire like cell which is present in a zig-zag like a snake.This shape in microbiology is termed as spirilla shape.While cocci are round, filamentous is a colony of cells/bacteria in line and rod shape means rod-like.Hence, in the picture there is a spiral shape cell or bacteria.Final answer:
The function of the structure identified by a red arrow in a bacterial cell could either be for mobility if it's flagella, or DNA transfer if it's pili. The morphology could be filamentous, cocci, rod-shaped, or spirilla, depending on the shape of the bacteria in the image.
Explanation:
The function of the structure identified by the red arrow depends on the specific structure it is pointing to. For bacteria, if the red arrow is pointing to flagella, the function is B) Mobility, as flagella are involved in the movement of the organism. If it is pointing to pili or fimbriae, then the function may be C) DNA transfer, as pili are often involved in the exchange of genetic material during a process known as bacterial conjugation.
As for the morphology represented in the picture (assuming the red arrow is pointing to a single bacterium), if it shows a chain of rod-like structures, the correct morphology would be A) filamentous. If it's a cluster of spherical cells, it would be B) cocci. Individual rod-shaped cells would indicate C) rod-shaped morphology. Lastly, if the cells are curved or helically-shaped, they would represent D) spirilla.
Describe the composition and physical characteristics of blood. what is the normal ph range of blood? how much blood does the average person have? what is viscosity? the temperature of blood is ___?
Blood is composed of red blood cells, white blood cells, platelets, and plasma, and is slightly more viscous than water. The normal pH range of blood is 7.35 to 7.45, indicating that blood is slightly alkaline. An average adult human has about 5 liters of blood, which is slightly warmer than body temperature.
Explanation:1. The composition of blood includes formed elements like erythrocytes (red blood cells), leukocytes (white blood cells), and platelets along with a fluid extracellular matrix called plasma. Plasma is primarily composed of water and also contains plasma proteins and various dissolved solutes like electrolytes and gases. Blood is also slightly more viscous than water, meaning it has a greater resistance to flow due to the formed elements and plasma proteins.
2. The physical characteristics of blood include its slightly thick, or viscous, nature, and its slightly higher temperature than the normal body temperature. Regarding the pH, the normal pH range of blood in a healthy person is slightly alkaline, measuring between 7.35 and 7.45. The pH is maintained by various buffers present in the blood.
3. On average, an adult human body contains about 5 liters of blood.
4. Finally, the temperature of blood is slightly higher than body temperature.
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Explain how conservation has saved the Bald Eagle.
Sorry I'm late, but here's what I wrote for my Online Content Assignment:
After World War II, a new pesticide that was said to be used for mosquito and other insect control. It's name was DDT. The residues from DDT began to wash away into waterways and were starting to be absorbed by plants and fish in aquatic ecosystems. Bald eagles eat fish often, it's the most common food that they prey on. When the bald eagles ate the contaminated fish, they got poisoned. The chemicals in the pesticide that went into the fish and, later on, the eagle, "interfered with the ability of the birds to produce strong eggshells". This caused many of the eggs that were laid to have very thin shells, resulting in the eggs failing to hatch or break in incubation. Along with bald eagles, DDT affected other birds that fed on fish as well. Bald eagles had become an endangered species after undergoing this poisoning, and lead poisoning in other incidents as well. The damage of DDT was brought to the public audience, and was spoken about through people that the public trusted. DDT was banned, which started to help the bald eagle population. Naming the species as "endangered" also helped catch the attention of people. People started to assist by helping the bald eagles recover from the population drop. All of these acts eventually led to the bald eagles getting taken off of the threatened and endangered list in 2007.
Sorry it's kind of long, I have a habit of writing a lot. You can of course shorten it to your liking and get rid of any details you think are unnecessary.
As always, I hope I helped you in any way possible!! I posted the same answer on 2+ of the same question, so keep in mind that it is the same person (me) who is posting them, so please don't report this for plagiarism!!
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Descending order arranges labels alphabetically from a to z.
a. True
b. False
A client develops subcutaneous emphysema after the surgical creation of a tracheostomy. what assessment by the nurse most readily detects this complication?
The right answer is Palpating the neck or face.
The collection of air in the inner layers of the chest or under the skin of the tracheostomy can result in pneumomediastinum or subcutaneous emphysema respectively.
The subcutaneous emphysema is recognized by the characteristic sensation of cracking when palpating the skin, swelling. In this case, you need to remove some of the sutures from the wound and loosen the bandage.
Which of the following is a feature of the sun's radiation?
It cannot travel through air.
It cannot travel through vacuum.
It is made up of rays of the same frequency.
It is made up of rays of different wavelengths.
Why does red cabbage sometimes turn purplish-blue when cut with a knife?
Red cabbage can turn purplish-blue when cut because its natural pigments, anthocyanins, react to changes in pH. When mixed with something basic, it turns blue to yellow; with acid, it becomes red or pink.
When red cabbage is cut with a knife, the color change to purplish-blue can sometimes be observed due to the exposure of its pigments to changes in pH level. Red cabbage contains natural pigments called anthocyanins, which change color in accordance with the pH of their environment. When in a neutral solution, the anthocyanin pigment is purple or violet.
If the red cabbage indicator is mixed with a slightly basic substance, it changes from purple to blue. When mixed with a strongly basic substance, it will turn yellow. If mixed with an acid, the red cabbage water will change to red or pink. This is why when red cabbage indicator paper is used, it can provide insight into the pH of substances it comes into contact with, turning different colors depending on their acidity or basicity.
Functions of the cell membrane include physical isolation of the cell from its surroundings, regulation of exchange, structural support, and which other function? functions of the cell membrane include physical isolation of the cell from its surroundings, regulation of exchange, structural support, and which other function? binding and delivery of oxygen extracting energy from the environment for cell survival radiation of heat to prevent protein denaturation and cell stress. communication between the cell and its environment
When population growth increases in an area, what is happening to the birth rate and age structure of that population?
a.increasing birth rate with a greater number of young organisms
b.increasing birth rate with a smaller number of old organisms
c.increasing birth rate with a smaller number of young organisms
d.increasing birth rate with a greater number of old organisms,
the answer not D i just got that answer wrong
The correct answer is:
a.increasing birth rate with a greater number of young organismsExplanation:When an area undergoing improvement in the population growth of the organisms that are living in it is ordinarily a result of a combination of many favorable factors. These circumstances commonly substitute for increasing birth rate, that is, the number of offspring that are been reproduce will increase significantly. This, in turn, will lead to an increase in the number of young living organisms in the population and ultimately in the number of young individuals that are rational of breeding, fortunately.
Which of the choices below is the parent cell for all formed elements of blood?
a. megakaryocyte
b. hemocytoblast
c. polymorphonuclear cell
d. natural killer cell
e. myeloid cell?
Answer:
b. hemocytoblast
Explanation:
Hemocytoblasts are the pluripotent stem cells present in the red bone marrow and have the ability to give rise to all types of cells present in the blood. For example, the formation of red blood cells from hemocytoblast includes myeloid stem cell, proerythroblast, intermediates stages of accumulation of hemoglobin and enucleation and finally the red blood cells. Likewise, hemocytoblast can also from various white blood cells and platelets from different cell pathway.
The parent cell for all formed elements of blood is the hemocytoblast, also known as a hematopoietic stem cell.
Option (b) is correct.
Hemocytoblasts are multipotent cells found in the bone marrow that have the ability to differentiate into various types of blood cells. They give rise to all the different types of formed elements found in blood, including red blood cells (erythrocytes), white blood cells (leukocytes), and platelets (thrombocytes).
Megakaryocytes are responsible for producing platelets, but they are derived from hemocytoblasts themselves. Polymorphonuclear cells and natural killer cells are specific types of white blood cells that are formed through the differentiation of hemocytoblasts within the bone marrow. Myeloid cells refer to a group of cells that include erythrocytes, granulocytes, monocytes, and platelets, all of which originate from the hemocytoblast.
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The leading cause of limited water supplies is _______. a. low precipitation b. overuse c. limiting use d. government
Answer: a. low precipitation
Precipitation is the amount of rainfall an area or a biome receives. It is the chief source of water for water bodies available for human use like lakes, rivers, ponds, groundwater. The amount of rainfall depends upon the vegetation growing in an area. The trees and plants transports water through the process of transpiration that adds up to the water cycle. Lack of vegetation can affect normal water cycle and can limit the occurrence and amount of rainfall. The lack of proper rainfall will limit the volume of water in water bodies and hence, will limit the water supply for use.
The leading cause of limited water supplies is overuse. Therefore, the correct option is B.
An important issue in water scarcity is the overuse of water resources. Human activities, including domestic water use, industry, and agriculture, can use up more water than is permanently available in a given location. With population growth and economic expansion, the demand for water increases, putting pressure on the already available water resources.
Limiting use is one way of managing water resources, although it is not the main cause of resource depletion. Government management and regulation of water resources are important, but they are not the root cause of scarce water supplies.
Therefore, the correct option is B.
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Which pair of drugs below are antagonists for the acetylcholinrgic muscarinic and nicotinic (respectively) receptors?
What are they impacts when people clear all the vegetation from the buffer zone next to a stream in order to build on or farm the land??
Describe how genetic mutations alter the dna sequence and may or may not not affect phenotype
Genetic mutations alter the DNA sequence by changing, inserting, or deleting nucleotides, potentially affecting phenotype, depending on the mutation's type and location.
Genetic mutations involve changes in the DNA sequence, which can occur through various mechanisms such as substitution, insertion, or deletion of nucleotides.
These alterations can disrupt normal gene function and protein synthesis, potentially leading to changes in phenotype—the observable characteristics of an organism.
However, not all mutations affect phenotype; some may be silent mutations that do not alter protein function, while others may occur in non-coding regions of DNA.
The impact of a mutation depends on its type, location, and the specific gene affected.
Which is the first type of cell to differentiate?
The first type of cell to differentiate is typically the neuron, option 1.
During the process of cellular differentiation, unspecialized cells become specialized to perform distinct functions. This is crucial for the development of a complex organism from a single fertilized egg.
The differentiation process begins with the formation of the three germ layers: ectoderm, mesoderm, and endoderm.
From these layers, specific cell types start to form. Neurons typically differentiate early from the neuroectoderm, which is a part of the ectoderm layer.
This early differentiation is essential for establishing the nervous system, which will regulate and control other bodily functions.
As the neuron cells differentiate, they acquire specific structures and functions that enable them to transmit nerve impulses.
This early specialization is critical as it sets the foundation for the development of the brain and spinal cord, allowing for further complex development of the organism.
Neurons: Early differentiation from neuroectoderm.Muscle cells: Differentiate from mesoderm.Blood cells: Also derive from mesoderm later in development.Epithelial cells: Arise from all three germ layers depending on their location.Understanding this hierarchical differentiation helps in grasping how specialized cells evolve to support various functions necessary for an organism's life.
complete question:
Which is the first type of cell to differentiate?
neuronepithelial cellmuscle cellblood cellWhich of the following pairs of structures share the function of rewarding water into the body
Plz help me fast
Is balamuthia mandrillaris a public health concern worldwide?
A black guinea pig crossed with an albino guinea pig produces 12 black offspring. when the albino is crossed with a second black one, 7 blacks and 5 albinos are obtained.
An arc flash can occur where differences of potential _____ exists.
Approximately what percent of all species on earth are parasites?
Approximately half of all species on Earth are parasitic at some point. Fewer than 20 percent of eukaryotic species have been documented, with a significant portion being parasites.
This is indeed a substantial portion of biodiversity, implying that the majority of interactions in nature are likely to involve parasitism. Considering eukaryotic species, it is largely believed that science has documented less than 20 percent of the species living on the planet. When it comes to the study of species diversity, there are still many species that are undescribed, with estimated numbers of species on Earth ranging widely, from 3 million up to 100 million.
Although exact numbers are difficult to ascertain, some studies suggest as much as 96% of marine species and 70% of terrestrial species can be parasitic. It's essential to recognize these figures when considering conservation and the importance of biodiversity, as parasitic species play crucial roles in ecosystems through their interactions with hosts and the environment. Parasites range from animals and plants to fungi and microorganisms.
The pyrimidine bases found in dna are ________ and cytosine.
The group of enzymes able to relax supercoils in dna is called
Scientists believe that the oldest known fossil discoveries to date are that of _________.
A. ammonites
B. trilobites
C. Tyrannosaurus rex
D. stromatolites
A base is best defined as a substance that
A base is a substance that releases hydroxyl ions or accepts hydrogen ions in solution, forming water. Bases can also be described using the Bronsted-Lowry or Lewis theories. They have distinctive properties such as being slippery, bitter, and turning red litmus paper blue.
A base is best defined as a substance that either releases hydroxyl ions (OH-) when dissolved in water, or operates as a hydrogen ion acceptor in an aqueous solution. These hydroxyl ions will then combine with any hydrogen ions (H+) present, forming water molecules (H₂O) and reducing the solution's acidity. This can also align with the Bronsted-Lowry theory, where a base is considered a substance that can accept hydrogen ions (H+) from the solution. Alternatively, in the Lewis theory, a base is described as a substance that donates an electron pair, forming a covalent bond with another atom. Bases can be identified by their slippery feel, bitter taste, and ability to turn red litmus paper blue. They can be strong or weak, with strong bases dissociating completely to release their hydroxyl ions, while weak bases only partially dissociate or absorb a few hydrogen ions from the solution.
Alarm, resistance, and exhaustion are all considered part of the body's ___________response.
adrenaline
stress
panic
autonomic nerve
im not sure if its autonomic nerve or stress,
What is a metabolic pathway? see section 16.1 (page 337) . view available hint(s) what is a metabolic pathway? see section 16.1 (page 337) . a process that results in mutations in genes a series of steps that convert a precursor to arginine a series of steps only found in neurospora crassa a series of steps in which enzymes work one at a time to convert a compound to a related compound?
The answer is a ‘series of steps in which enzymes work one at a time to convert a compound to a related compound’. The intermediate products of metabolic pathways are called metabolites. An example of a metabolic cycle is the Glycolysis and Krebs cycles. The product in each step of the metabolic pathways becomes the substrate of the next step in the pathway. There are two types of metabolic pathways; anabolic and catabolic