Final answer:
The shutdown of the menstrual cycle and ovulation in female athletes with low body fat and estrogen levels is an evolved adaptation to prevent pregnancy during times of physical stress or low energy reserves, as a way to conserve energy and ensure the mother has sufficient resources for a successful pregnancy.
Explanation:
The evolutionary cause of the shutdown of the menstrual cycle and ovulation in female Olympic athletes who train severely and experience a significant loss of body fat can be understood as a protective mechanism. The body requires a considerable amount of resources to maintain a pregnancy, and during periods of extreme physical stress or when energy reserves are low, it may not be advantageous for reproduction to occur.
If the body senses that it is not in an optimal state for supporting a pregnancy due to low levels of estrogen and fat tissue, it may shut down the reproductive cycle to conserve energy and prevent a pregnancy that could be risky for both the mother and potential offspring.
This response is likely an evolved adaptation to increase overall reproductive success by ensuring that pregnancy occurs only during times when the mother has sufficient resources to support both herself and the developing fetus.
Ovulation occurs in the ovary, forming the corpus luteum at the end of this phase. ovulation results in the release of an ovum from the ovary. the remaining follicle becomes a corpus luteum at the end of which uterine phase?
The luteal phase is one of the phases of ovarian cycle (follicular phase and ovulation are the other two). It is the final phase of the ovarian cycle and it corresponds to the secretory phase of the uterine cycle. During this phase, the transformation of the dominant follicle into the corpus luteum is stimulated by pituitary hormones FSH and LH. Corpus luteum produces progesterone which makes the endometrium receptive to implantation of the blastocyst.
What is the mortality rate of sickle cell anemia in the africa?
Is drinking a beer with double abv like drinking two?
The phenomenon in which rna molecules in a cell are destroyed if they have a sequence complementary to an introduced double-stranded rna is called
a. rna interference.
b. rna obstruction.
c. rna blocking.
d. rna targeting.
e. rna disposal.
Answer: a. rna interference.
Rna interference was known by other names like co-suppression because it has become evident that RNAi has immense potential in inhibiting desired genes by neutralizing targeted mRNA molecules Two types of small ribonucleic acid (RNA) molecules that are central to RNA interference are miRNA and siRNA.
Which is the best way to help earth’s water supply last for future generations?
A. Make factories recycle water
B. Increase neighborhood lawn sprinkling
C. Build thermal power plants
D. Avoid drop irrigation system on farms
The best way to help the Earth’s water supply last for future generations is to make factories recycle water.
How can we reuse recycled water?Agriculture irrigationIrrigation for parks, rights-of-ways, and golf coursesMunicipal supply of waterProcess water for companies, mills, and power plantsInside purposes like flushing the toiletRoadways, building sites, and other heavily traveled areas: dust control or surface cleaningMixing concrete and other construction techniquesSupplying inland or coastal aquifers, as well as manmade lakesRehabilitation of the environmentLearn about water recycling here:
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Final answer:
Making factories recycle water is the best choice among the given options to help conserve Earth's water supply. Other key strategies include using efficient irrigation systems like drip irrigation, planting native vegetation, installing water-saving devices, and reusing greywater for non-potable purposes.
Explanation:
The best way to help Earth’s water supply last for future generations is to implement practices that promote water conservation and efficient use. Among the options given, making factories recycle water is the best choice, as it can significantly reduce the industrial demand for freshwater by reusing processed water. Additional strategies include efficient irrigation techniques like drip systems emphasized in agriculture to minimize losses due to evaporation, and growing crops in areas where natural rainfall is sufficient thereby reducing dependency on irrigation. The use of native, drought-tolerant vegetation and water-saving devices such as low-flow toilets and faucets can further contribute to conserving water. Rainwater harvesting and the reuse of greywater for non-potable applications can also play an important role. It's crucial that we focus on these water conservation methods as agriculture is the largest user of water, mostly for irrigation, and enhancements in irrigation efficiency are particularly valuable for achieving sustainability in water resources.
Bees visiting flowers to harvest pollen and carrying some to pollinate other plants would be considered an example of _____. see section 52.1 (page 1093) .
How does climate affect the nature and location of tropical rainforests?
How many megawatt hours (MWh) per year of savings did the students identify for computers at the Penn State Mueller Laboratory Building?
There are 30-megawatt hours (MWh) per year of savings the students had identified for computers at the Penn State Mueller Laboratory Building. At Pennsylvania State University, an undergraduate class studied an environmental evaluation in one of their laboratory buildings in biology. They want to answer the question, "How is this building like an ecosystem?" Their evaluation result was a report that contains 52-page noting ways to lessen the Mueller Laboratory Building’s environmental footprint in terms of water, energy communications, maintenance, renovation, and food usage. The students establish techniques to save an almost $45,500 yearly in the energy cost alone for a building with 123 scientists and backing staff.
Which of the following characteristics do all plants have in common? A. unicellular, prokaryotic, heterotrophic B. unicellular, eukaryotic, photosynthetic C. multicellular, prokaryotic, heterotrophic D. multicellular, eukaryotic, photosynthetic
Answer:
D. multicellular, eukaryotic, photosynthetic
Explanation:
I took the test and got it right
The characteristics that all plants have in common are they are multicellular, eukaryotic, and photosynthetic. Therefore, the correct option is D.
What are eukaryotic organisms?Eukaryotic organisms are the organisms which are multicellular and have a well-defined nucleus and other organelles.
Plants are multicellular organisms and are eukaryotic with well-defined membrane bound organisms. They are photosynthetic in nature, which means that they carry out the process of photosynthesis, which is the conversion of solar light to chemical energy for the production of glucose.
They are present under the kingdom Plantae which have cell wall made up of cellulose. They also have chloroplasts, which are centers of photosynthesis. They have specialized reproductive organs to carry out reproduction. Therefore, the correct option is D.
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Where are barbules and pinnae connected to the feathers ?
Structure within a cell that direct with type of protein make
Clear-cutting ________. restricts timber harvesting to mountaintops is harvesting trees from coastal areas only involves elimination of subsidies to farmers is a form of violent protest favored by radical environmental organizations removes all trees from an area
____ is a hormone secreted by the pituitary gland that stimulates ovulation or testosterone secretion.
List two ways that bacteria can produce illness
"why is it difficult to grow bordetella pertussis in a laboratory"
It is difficult to grow bordetella pertussis in a laboratory because of its inability to grow on ordinary laboratory media such as nutrient agar or macconkey agar. The organism will only grow on specialized media supplemented with charcoal, blood (20%), potato (starch) in order to absorb toxic substances which can inhibit its growth in the agar.
When human-trafficking victims are children forced to work without pay, it is considered _____.
smuggling
severe
forced labor
sex tourism
Answer:
The answer is option B.
Explanation:
Components of human trafficking. With the end goal of misuse, which incorporates abusing the prostitution of others, sexual abuse, constrained work, bondage or comparative practices and the expulsion of organs.The United Nations characterizes human trafficking as the enrollment, transportation, exchange, harboring, or receipt of people by inappropriate means, for example, drive, snatching, extortion, or pressure for an ill-advised reason including constrained work or sexual misuse.
Dams allow a rivers natural power to be converted into useful what
Which of the following statements best proves that the law of conservation of mass is obeyed during photosynthesis?
A: The starting total number of oxygen atoms in carbon dioxide is equal to the ending total number of oxygen atoms in glucose.
B: The starting total number of oxygen atoms in carbon dioxide gas is equal to the ending total number of oxygen atoms in glucose and oxygen.
C: The total mass of glucose and oxygen formed from photosynthesis is equal to the total mass of carbon dioxide and water used up during the reaction.
D: The total mass of glucose and carbon dioxide formed from photosynthesis is equal to the total mass of oxygen and water used up during the reaction.
The answer is: C. The total mass of glucose and oxygen formed from photosynthesis is equal to the total mass of carbon dioxide and water used up during the reaction.
The law of conservation of mass states that in a closed system, the total mass of the reactants must be equal to the total mass of the products formed during a chemical reaction. This principle applies to the process of photosynthesis, which involves the conversion of carbon dioxide and water into glucose and oxygen.During photosynthesis, carbon dioxide and water molecules are the reactants, and glucose and oxygen molecules are the products. According to the law of conservation of mass, the total mass of the products (glucose and oxygen) formed must be equal to the total mass of the reactants (carbon dioxide and water) consumed.Option C correctly states this principle, indicating that the total mass of glucose and oxygen formed from photosynthesis is equal to the total mass of carbon dioxide and water used up during the reaction. This statement directly reflects the law of conservation of mass, ensuring that the total mass remains constant before and after the photosynthetic process.The other options either do not consider the masses of all reactants and products or incorrectly pair the masses of different substances, violating the law of conservation of mass.
Why is the blood-testis barrier important?
a. because some blood contents are toxic to the spermatozoa
b. because immature sperm cells lose their motility when they encounter any blood component
c. because spermatozoa and developing cells produce surface antigens that are recognized as foreign by the immune system
d. actually, the blood-testis barrier has no function?
Inside each of your lungs there are tubes called bronchi. these branch into even smaller tubes much like the branches of a tree. what are at the ends of these tubes?
Answer: Small air sacs.
Explanation:
Which two chemicals, found in the sting gland, produce a synergistic response when combined?
The fundamental excitable cell in the nervous system is the _____. see concept 49.1 (page 1084)
Neuron
Neuron can be defined as excitable cell that usually carries, processes and transmit impulses or electrical signals. Thus, they are known to be basic unit of the nervous system which includes the spinal cord and brain. However, the signals between s neurons occur via certain connections called synapses.
The fundamental excitable cell in the nervous system is the neuron. Neurons transmit electrical signals, called action potentials, to convey information and produce movements in response to stimuli. They are also involved in thought processes within the brain.
Explanation:The fundamental excitable cell in the nervous system is the neuron. Neurons are responsible for transmitting electrical signals, called action potentials, that convey information and produce movements in response to stimuli. They also play a crucial role in thought processes within the brain.
Neurons, the fundamental units of the nervous system, feature a cell body (soma), dendrites for receiving signals, and an axon for transmitting signals to other neurons or cells. Axon terminals release neurotransmitters, facilitating communication at synapses. Neurons exhibit electrochemical signaling, enabling the transmission of information throughout the nervous system, vital for cognition and behavior.
Prokaryotes whose cell walls do not contain peptidoglycan domain
BRAINLIESTTTT ASAP!!!
1. Which two particles are present in the nucleus of an atom?
Electrons and neutrons
Electrons and molecules
Protons and neutrons
Protons and electrons
2. Boron is to the immediate left of carbon in the same row in the periodic table. Which of the following statements compares the radius and pull exerted by the protons of boron and carbon atoms?
Boron has a smaller radius and the protons in carbon exert a greater pull.
Boron has a larger radius and the protons in carbon exert a greater pull.
Boron has a smaller radius and the protons in carbon exert less pull.
Boron has a larger radius and the protons in carbon exert less pull.
1. Protons and neutrons are present in the nucleus of an atom.
2. Boron has a smaller radius and the protons in carbon exert a greater pull.
The nucleus of an atom contains protons, which have a positive charge, and neutrons, which have no charge. Electrons, which have a negative charge, orbit around the nucleus in electron shells.
Boron is located to the left of carbon in the same row of the periodic table. As you move across a row from left to right, the atomic radius generally decreases. Therefore, boron has a smaller radius than carbon.
The protons in carbon exert a greater pull because the effective nuclear charge is higher due to the increased number of protons.
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Movement of dissolved substances in fluid from areas of high concentration to areas of low concentration
If "quercus" is the genus name and "rubrus" is the species name for a red oak tree, which is the most correct written form of the red oak tree's scientific name?
Using binomial nomenclature, a red oak tree's scientific name should be written as 'Quercus rubrus.' The genus name is capitalized, and the species name is all in lowercase. Both names are typically italicized.
Explanation:In biology, when writing scientific names for organisms, the naming follows the binomial nomenclature format. This involves writing the genus name first followed by the species name. The correct written form, therefore, of the scientific name for a red oak tree would be Quercus rubrus. The genus name starts with a capital letter, the species name should be in lowercase and the whole name should be written in italics.
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Metastasis is the term used to describe the cancer cell's ability to
What organ system is monetly responsible for generating behavior in multicellular animals?
Nervous system is the organ system that is mostly responsible for generating behavior in multicellular animals. The nervous system coordinates multicellular animal’s behavior and transmits signals within the body. Specific excitatory and inhibitory substances are produced by the nerve cells for them to interact with each other and certain chemicals, sound and light is detected by the sense organs such as ear and nose which control the behavior and movement of multi cellular animals in their environment.
What inables humans to see light in the infared range of the electromagnetic spectrum?
Jan is very fearful of speaking in public and will do everything she can to avoid being evaluated by others, which causes her significant impairment. the most accurate diagnosis would be:
Social anxiety disorder is characterized by anxiety and fear of being judged or evaluated. Individuals with social anxiety disorder frequently avoid performance or social functions and they experience a rapid heart rate, nausea, and sweating, and full-blown attacks when confronting a feared situation. For the question given above, the most accurate diagnosis would be social anxiety disorder.