Evolution of Monotreme: About 150 million years ago, the first monotreme have evolved. Early fossils of monotreme have been found in Australia. A genus called steropodon is an example.
Evolution of Marsupial: About 150 million years ago, the first marsupial have evolved. A genus called sinodelphys which was about 6 inches long is an example of earliest found extinct genus.
Evolution of Placental mammals: About 110 million years ago, the earliest placental mammal have evolved. The extinct genus eomaia is an example of this. It was only 4 inches long.
Answer:
Evolution of Monotreme: About 150 million years ago, the first monotreme have evolved. Early fossils of monotreme have been found in Australia. A genus called steropodon is an example.
Evolution of Marsupial: About 150 million years ago, the first marsupial have evolved. A genus called sinodelphys which was about 6 inches long is an example of earliest found extinct genus.
Evolution of Placental mammals: About 110 million years ago, the earliest placental mammal have evolved. The extinct genus eomaia is an example of this. It was only 4 inches long.
Explanation:
Where in a lake is the benthic zone?
A. Above the limnetic zone
B. On the surface near the middle
C. Along the bottom
D. In the shallow water near the shore
Answer: C. Along the bottom
Explanation:
The benthic zone is an lowermost ecological region of the aquatic water body like ocean, river, lakes and pond. It includes the sediment surface and the layers of water above it. It receives very little sunlight penetration of only 1%. As a result of this, the zone remains dark and animals show bio-luminescence in order to search and capture prey.
On the basis of the above explanation, the benthic zone in a lake can be found C.along the bottom.
Which of the following nitrogen bases in unique to rna?
Uracil
Thymine
Cytosine
Explanation:
The RNA gets its information from DNA to synthesise the proteins. It is different from DNA also due to the difference in one nitrogen basis as uracil. The thymine, the nitrogen basis that is only present in DNA is replaced with uracil to form RNA coding. The uracil also contains the same features as thymine has in DNA strains. Uracil makes a double H-bond with the adenine but does not contain CH4 group which is present in thymine.
A fracture in the shaft of a bone would be a break in the ________.
A break in the shaft of a bone would be a fracture in the diaphysis. The diaphysis is the central portion of a long bone and is primarily composed of compact bone. Recovery can require immobilization, splinting, or, in severe cases, surgical intervention.
Explanation:A fracture in the shaft of a bone would be a break in the diaphysis. The diaphysis is the long, cylindrical shaft of a bone and is composed primarily of compact bone. When a fracture occurs in this area, it can be quite severe due to the mechanical role the diaphysis plays in supporting body weight and facilitating movement. Depending on the nature of the break, recovery can involve immobilization, splinting, or in severe cases, surgical intervention such as inserting metal pins or plates to stabilize the bone.
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the study of genetics and inheritance begins with a look inside the nucleus of a cell true or false
The statement about the genetics and inheritance is true.
The genetic material is present inside the nucleus so to look for it we have to look inside the nucleus.The nucleus contain all the genetic material which is then transferred into the offspringWhat is genetics?It is the branch of biology that is concerned with the study of genes, genetic variation and hereditary in organisms.Understanding the genetics helps in learning more about promoting and preventing diseases.To know more about genetics here
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Neptune and uranus both appear bluish in sunlight whereas jupiter and saturn are multicolored. why are neptune and uranus blue?
Most annelids in the taxonomic class Polychaeta live in ______ environments.
1.Tundra
2.Desert
3.Marine
4.None Of The Above
The answer is marine.
Explanation:
In the taxonomic class of polychaeta, most annelids are marine and have parapodia and setae. Parapodia are paddle like appendages used in swimming that also serve as respiratory organs. Setae are bristles attached to parapodia that help anchor polychaetes to their substratum and also help them move. The clam worms which as nereis are active predators of annelid. Some have well-built cephalization with a head having well-built jaws, eyes, and other sense structures. Sedentary filter feeders have tentacles with cilia to make water flows and to choose food elements. Only for the period of breeding do polychaetes have reproductive organs. Polychaeta zygotes develop into a type of larva similar to that produced by marine clams.
Homeostasis is defined as a state in which the conditions of an organism's internal environment are maintained within tolerable limits. What mechanisms in your body are involved with homeostasis?
The major anatomical difference between gray matter and white matter is __________. the major anatomical difference between gray matter and white matter is __________. that white matter is primarily in the cns the presence of myelinated axons that white matter is located deep to the gray matter that gray matter is functionally organized into tracts
The major anatomical difference between gray matter and white matter is the presence of myelinated axons in white matter. Gray matter is functionally organized into nuclei, while white matter consists of tracts connecting different regions of the central nervous system.
Explanation:The major anatomical difference between gray matter and white matter in the nervous system is the presence of myelinated axons in white matter. Gray matter consists of cell bodies, dendrites, and unmyelinated axons, and it is functionally organized into nuclei or regions involved in processing information. On the other hand, white matter is composed primarily of myelinated axons that form tracts connecting different regions of the central nervous system.
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When encountering another vessel in darkness or reduced visibility, what is indicated by the presence of only a visible white light?
When encountering another vessel in the darkness or in reduced visibility, the presence of only the white light indicates that you are overtaking another vessel. So, give way to either side.
Further explanation:
White light only:
When you are encountering another vessel in the reduced visibility or darkness, then the presence of only the white light shows that you are overtaking any other vessel. In this situation you should give way to either side, while the other vessel over taken should stand on.
White and red light:
In darkness when encountering another vessel, when the red and the white lights are present then it shows that you are approaching to the port side of the power boat. So, give way to your starboard side.
White and green light:
In darkness when you are encountering another vessel, when the green and white light are visible then you should stand on because you are approaching the starboard side of the power boat.
White, red and green lights:
When all white, red and green lights are visible then it means that you are approaching a power boat head on. So, you should give a way to starboard side. All these navigation lights indicate specific conditions. So, while boating in the reduced light you should be very careful.
Answer details
Subject: Biology
Level: High school
Key words:
White light only White and red lights White and green lights White, red and green lightsLearn more to evaluate
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When viewing red blood cells under a microscope a scientist can determine they came from a human because they :?
Human red blood cells can be identified under a microscope by their anucleated state, distinguishing them from other animals' red blood cells, and their biconcave shape. They contain a large amount of hemoglobin, which is critical for oxygen transport.
When a scientist views red blood cells under a microscope, they can determine they came from a human because human red blood cells are anucleated. This means they do not contain nuclei, in contrast to the red blood cells of many other animals which do have nuclei. Additionally, the human red blood cells are characteristic in their shape - they are described as biconcave or bowl-shaped. This specific morphology is visible under a microscope, especially when using a scanning electron microscope. In humans, these cells also possess a remarkable capacity for carrying oxygen due to the abundance of the protein hemoglobin. Each human red blood cell contains about 250 million molecules of hemoglobin, each capable of binding four oxygen molecules.
Unlike other mammals, human red blood cells are anucleated, meaning they have no nuclei, which is a distinctive feature. Some other mammals may have nucleated red blood cells. This lack of nucleus allows for a greater concentration of hemoglobin and consequently, a much higher efficiency in transporting oxygen throughout the body. The adaptation to have anucleated red blood cells in mammals is thought to enhance this oxygen transport capacity, as it allows more space for hemoglobin within each cell.
Populations of organisms that have sigmoid growth curves limited by the carrying capacity are called
Populations of organisms that have sigmoid growth curves limited by the carrying capacity are called K-selected.
Species are divided into two selected species, R-selected species and K-selected species. K-selected species are also called K-strategist. These are the species whose populations vary at or near the carrying capacity (K) of the environment in which they live.
At any level of organization, groups that have biological meaning are referred to as
A. systems.
B. cladograms.
C. taxa.
D. binomials.
The correct answer is C. taxa. At any level of organization, groups that have biological meaning are referred to as taxa.
In biology, a taxon (plural taxa) is a group of one or more populations of an organism or organisms seen by taxonomists to form a unit. Taxa are arranged in a hierarchy from kingdom to subspecies, accommodating the diversity of life. The biological meaning of a group is best captured by the concept of taxa, as they represent the classification levels used to categorize living organisms based on shared characteristics.
Here is the reasoning for each option:
A. Systems - This term is too broad and not specific to biological classification. A system can refer to any organized, purposeful structure, such as an ecosystem, a body system (like the circulatory system), or even a computer system. It does not specifically refer to groups with biological meaning.
B. Cladograms - A cladogram is a diagram used in cladistics to show relations among organisms. It is a tool for visualizing the evolutionary tree of life, but it does not refer to the groups themselves; rather, it shows the relationships between taxa.
C. Taxa - This is the correct term for groups of organisms that have biological meaning. Taxa are the result of the process of taxonomy, where organisms are grouped together based on shared characteristics and evolutionary relationships.
D. Binomials - This term refers to the two-part name given to species, consisting of the genus name followed by the species name (e.g., Homo sapiens for humans). While binomials are a part of taxonomy, they specifically apply to the naming of species and do not encompass the broader range of biological groupings that taxa do.
Photosynthesis is an __________ process in which carbon is __________, whereas cellular respiration is an __________ process in which carbon is __________.
Photosynthesis is an endothermic process in which carbon dioxide is fixed into glucose using sunlight, and oxygen is released. Cellular respiration is an exothermic process in which the glucose is oxidized back into carbon dioxide, releasing stored energy as ATP.
Photosynthesis is an endothermic process in which carbon is fixed, whereas cellular respiration is an exothermic process in which carbon is oxidized. In photosynthesis, green plants convert carbon dioxide and water into glucose and oxygen, using sunlight as the energy source. The chemical formula for this process is 6CO2 + 6H2O --(in the presence of sunlight)--> C6H12O6 + 6O2. This process not only creates glucose, which plants use as 'food,' but also contributes vital oxygen to the atmosphere, essential for animal life.
On the other hand, cellular respiration is how cells convert the stored chemical energy within glucose into usable energy called ATP (adenosine triphosphate). During this process, oxygen is used to break down glucose, which results in the production of carbon dioxide and water as waste products, releasing energy in the process.
In small populations gene frequencies can change drastically by chance alone this is called
Brian comes to the block area and knocks down a building that Tim and Jody are constructing. The most probable reason for Brian's misbehavior is that he A. is destructive by nature. B. has too much self-esteem. C. is seeking attention. D. has lost control.
Application of autologous growth factors on skeletal muscle healing.
To create a simulation of 20,000 sheep grazing in an isolated valley, a scientist needs to determine the average amount of grass eaten per day by an actual sheep. Which of the following is the best course of action for establishing this parameter?
A. Divide the total amount of grass eaten by all sheep in the valley by 20,000.
B. Determine the average daily grass consumption for 20 randomly selected sheep.
C. Choose a random value to use as the daily amount of grass eaten by one sheep.
D. Measure the amount of grass eaten per day by a single sheep.
Answer: B <3
Explanation:
How does diffusion cause culture change?
Which of the following X-linked disorders affected Queen Victoria’s descendants and became known as the “Royal disease”? a. Rett’s syndrome c. Muscular dystrophy b. Colorblindness d. Hemophilia
The nurse is preparing to administer a nasogastric tube feeding to a client via infusion pump. what is the most important assessment the nurse needs to perform before beginning the pump?
Whereas the hormone __________ is involved in fat regulation, __________ originates in the stomach and triggers hunger?
Which nonforfeiture option provides coverage for the longest period of time?
Which describes the four cells that are produced at the end of meiosis? identical haploid cells genetically different diploid cells genetically different haploid cells identical diploid ce?
Correct answer: C). Genetically different haploid cells
Meiosis is a type of cell division in which four haploid cells are produced, which are genetically different from the parent. It reduces the chromosome number exactly half as contained in the parent. That is why it is called as a reductional division.
In the first round of meiosis I homologous pairs of chromosome separate and the sister chromatids separate during meiosis II.
Enzymes are proteins that need to have a shape consistent with the receptor in the reaction for which the enzyme is needed. if a protein enzyme is formed incorrectly, slightly altering its three-dimensional shape, what might happen?
What is the primary tool used in dissections - the one that is best for cutting skin and tissues while preventing damage to internal structures?
Potatoes, like most cells, are composed of approximately 99% water. When freshly peeled potatoes are placed into a bowl of pure water, what will happen to the potatoes?
A. they will shrink due to water leaving the potato
B. they will have no change since the amounts of water entering the potatoes will balance the amounts of water leaving the potatoes
C. the potatoes will absorb some of the water and become firmer
D. the potato cells will absorb a great deal of water and burst
The irreversible increase in the size or mass of an organism as it develops is known as
Which would be most responsible for prolonging a wound healing in the older resident?
Depression could most likely prolong wound healing in older adults by reducing their motivation to engage in necessary healthcare activities. Increased social contacts and adequate fiber intake have different health benefits but do not directly delay wound healing. Option A is correct .
Wound healing in older adults can be significantly influenced by various factors. Among the options provided, depression could be most responsible for prolonging wound healing. Research has shown that depression and quality of life have a crucial impact on patients with chronic wounds.
According to Renner and Erfurt-Berge (2017), depression can lower an individual’s motivation to participate in healthcare activities, potentially leading to delayed wound healing.
In contrast, increased social contacts may have a positive effect by providing emotional support and reducing stress, which can facilitate healing. While an increase in adipose tissue might affect overall health, it doesn’t directly prolong the wound healing process.
Similarly, an adequate intake of fiber (20 to 35 grams per day) is important for digestive health but does not directly impact wound healing duration in the context provided.
Complete question :
Which would be most responsible for prolonging a wound healing in the older resident?
A. Depression
B. Increased social contacts
C. An increase in the adipose tissue
D. An intake of 20 to 35 g. of fiber per day
Motor (efferent) neurons carry information _____ the brain whereas sensory (afferent) neurons carry information ______ the brain.
What is the difference between plant ecm and mammalian ecm?
The ECM of plant and mammalian cells differ based on their structural needs. The mammalian ECM focuses on providing support and cellular communication, whereas plant cells, with a rigid cell wall, utilize plasmodesmata for communication between cells. Additional structures like chloroplasts and a large central vacuole are unique to plant cells.
Explanation:The Extracellular Matrix (ECM) varies between plant and mammalian cells due to their different structure and function requirements. Mammalian cells, lacking a cell wall, produce an ECM composed mainly of carbohydrates and proteins, which provide structural support. This network is composed of fibrous proteins like collagen, attached to fibronectin proteins, which then interact with transmembrane proteins. The ECM components mediate cellular signaling and form a basement membrane to which they adhere.
On the other hand, Plant cells, due to the presence of a cell wall, adhere less onto ECM for structural support. Their ECM is less pronounced than in mammalian cells. They mainly rely on plasmodesmata, channels that pass through the cell wall for communication and sharing of resources between neighboring cells.
Junctions in mammalian cells include tight junctions, gap junctions, and desmosomes, whereas plant cells communicate through plasmodesmata. Additionally, plant cells possess structures like the cell wall, chloroplasts, and a large central vacuole, which are absent in animal cells.
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