Natural selection is a nature-made selection, and artificial selection is a man-made selection. Natural selection is the work of nature itself and no human interaction is involve in this process. Plants and animals breed according to the flow of nature. While on the other hand artificial selection produces diversities of organisms such as improved crops and livestock.
While at the shore, you and your friend Maria find a nest containing the fossilized remains of an animal. The nest, covered with sand, contains the skeleton and six preserved eggs. Maria believes you have discovered a bird nest. You believe it is a turtle nest. What evidence would support Maria's claim that the fossilized remains are that of a bird, class Aves, instead of a turtle, class Reptilia? A) the eggs B) a backbone C) a keeled sternum D) warm-bloodedness
Answer:
The correct answer is C) a keeled sternum.
Explanation:
Fractures of the _______ of long bones are especially common in young animals.
A. condyle
B. epiphysis
C. epiphyseal plates
D. diaphysis
Which of the following terms describes the study of genes during the 1900s?
a certain tapeworm secretes a chemical that slows the intestinal pulsation of its host. this helps to ensure that the tapeworm isnt expelled from the body of the host. explain how adding this chemical to a drug for humans might increase the drugs effectiveness
Of all planets in our system jupiter has the greatest gravitational strength
when the contents of a vesicle are released by the cell ?
Answer:
Cells discharge cell substance through different instruments. The substance of secretory vesicles are discharged from cells by exocytosis when vesicles meld with the plasma film.
Explanation:
Exocytosis serves a few imperative capacities as it enables cells to emit squander substances and atoms, for example, hormones and proteins. Likewise, exocytosis is utilized to reconstruct the cell layer by melding lipids and proteins evacuated through endocytosis once again into the membrane.For precedent a couple of the procedures that utilization exocytosis are: discharge of proteins like catalysts, peptide hormones and antibodies from cells. turnover of plasma layer.
in 1941, ______ was the first used successfully to treat an infection caused by a bacterium.
Albert Alexander was the first patient to be successfully treated on an infection caused by bacteria. He accidentally scratched a thorn of a rose on his face which badly infected him. One of his eyes had also been removed. He was given an infusion of 160 mg of penicillin on February 12, 1941, and within 24 hours, his wounds begun to heal. He, however, died on March 1941.
Which organ suffers the least damage during prolonged starvation?
Grace recently took a cruise onboard a luxury liner. a few days into her vacation, she developed signs of ____ infection, the most common food-borne illness in the united states.
a. anisakis
b. trichinella
c. botulism
d. norovirus
The right option is d. norovirus infection
Noroviruses are viruses that cause gastroenteritis ; a condition that causes vomiting, fever and stomach pain. Norovirus is highly contagious. It spreads through contaminated food or water and through close contact with an infected person. Norovirus is the common cause of epidemics of gastroenteritis on cruise ships and it is the most common food-borne illness in the united states.
In everyday life, a theory is an educated guess. In science a theory is A) an accepted claim. B) an unsubstantiated truth. C) an unsubstantiated claim. D) a well-supported explanation.
What events took place in anna's immune system when invaded by the s. marcescens infection? be specific in your response?
The immune system started to use its antibiotics to battle the infection. It also sent B-Cells to fight the infection while the T-cells kept that immune system strong. The immune system also inflamed the muscles to know where the antigens were so it knew where to kill them
When Anna's immune system was invaded by the s. marcescens infection, the immune system induces pro-inflammatory substance called Cytokinesis.
Explanation:
Apart from this it initiates the release of protein called as antibodies which are responsible for identification and elimination of disease causing pathogens from the body.
S. marcescens refers to gram negative bacteria which cause serious urinary as well as respiratory infections. Usually it is found in places such as hospitals, soil and water.
Many yogurt containers have a seal that says contain live cultures. This means that there are live bacteria in the yogurt which can function as probiotics. Which sentence BEST describes the purpose of these probiotic bacteria?
A-the bacteria are beneficial because they give the yogurt it’s fruit flavors
B-the bacteria are beneficial because they provide an additional source of protein in the yogurt.
C-the bacteria are beneficial because they act as a preservative to extend the shelf life of the yogurt
D-the bacteria are beneficial because they can improve the balance of good bacteria in a persons intestines.
Why does the heart start pumping blood to all the cells so early in pig development
True or False
Genetics account for all differences in animals.
plz asap . 27 points
Constructed Response: Exploring the South American rain forest, a scientist discovers a mysterious organism and brings it back to the lab for further study. What cell characteristics should the scientists examine to tell whether the organism is an animal or plant? Why?
Of what benefit is sodium bicarbonate in the blood?
proposed the polynucleic model, stating that DNA and RNA were composed of nucleotides
The polynucleotide model, suggested by Alexander Todd and Erwin Chargaff, states that DNA and RNA are composed of nucleotides, which include a sugar molecule, a phosphate group, and a nitrogenous base. The sequence of these bases forms the genetic code.
Explanation:The polynucleotide model was proposed by biochemists Alexander Todd and Erwin Chargaff. This model states that DNA and RNA are composed of nucleotides, the building blocks of these macromolecules. Nucleotides are made up of a sugar molecule, a phosphate group, and a nitrogenous base. In DNA, these bases are adenine, guanine, cytosine, and thymine, while in RNA, thymine is replaced by uracil. The number and sequence of these bases determine the genetic code.
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Predict: some pathogens are spread directly from one person to another. this can happen when people come into direct contact or share items, such as drinking glasses. what do you think might affect how quickly a pathogen is spread from person to person?
Factors that affect how quickly a pathogen is spread from person to person include physical contact, sharing items, hygiene practices, and the strength of the immune system.
Explanation:There are several factors that can affect how quickly a pathogen is spread from person to person:
Physical contact: Pathogens are more likely to be spread when there is direct physical contact between individuals. Examples of direct contact include touching, hugging, or kissing.Sharing items: Pathogens can be transmitted when people share items such as drinking glasses or utensils. This is known as indirect contact transmission.Hygiene practices: Practicing good hygiene, such as frequent handwashing, can help reduce the spread of pathogens between people.Immune system: The strength of a person's immune system can also affect how quickly they can become infected by a pathogen. A strong immune system can help fight off pathogens more effectively.Learn more about Factors that affect the spread of pathogens from person to person here:https://brainly.com/question/25793322
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The graph gives information on greenhouse gas (GHG) emissions from US industries. Which year had the lowest GHG emissions from industrial activity?
1990
1996
2004
2013
2009
2009 its lowest there on the graph
Which is a component of the modern cell theory that was not part of the original cell theory? All organisms are made of cells. All cells are similar in composition and metabolic activities. All cells come from preexisting cells. A cell is the basic unit of structure and function for all living things.
All organisms are made of cells. All cells are similar in composition and metabolic activities. Thus, the correct option is A.
The first theory about cell was proposed by two German biologist Theodor Schleiden and Matthias Schwann in 1839.
What are the postulates of cell theory?The main postulates of this theory are as follow:
1. Cell is the basic structural and functional unit of living organisms.
3. All living organisms are composed of cells.
3. New cells arise from already pre existing cells by division.
Modern cell theory is the new version of same cell theory. It also added that all cells are chemically similar in composition and metabolic activities. Cells contain hereditary materials and energy flow occurs with in cell.
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Bones consist of cells suspended in an extracellular matrix. A bone is a type of
Bones consist mainly of bone tissue, which is a type of connective tissue mineralized with calcium and phosphorus crystals.
Explanation:Bones are organs that consist mainly of bone, or osseous, tissue. Osseous tissue is a type of connective tissue consisting of a collagen matrix that is mineralized with calcium and phosphorus crystals. The combination of flexible collagen and minerals makes bone hard without making it brittle.
which factor would increase an area's carrying capacity for prairie dogs
The correct answer is option B, that is, increased availability of food.
The carrying capacity of a biological species in surrounding refers to the majority of the size of the population of the species, which the environment can maintain indeterminately, given the habitat, food, water, and other essential necessities in the environment.
In terms of population biology, carrying capacity is illustrated as the maximum load that can be handled by the environment. Thus, in the given case, the carrying capacity of the prairie dogs in an area gets increased with the increase in the availability of food.
Answer:
b
Explanation:
which of the following soils has the roughest texture potting soil silt clay sand
Answer:sample c
Explanation:
A. what role does mrna play in the flow of information in the cell? (hint: remember the central dogma of molecular biology.) please include the basic flow of information in the cell.
Two homologous sets of genes" can mean either two similar collections of genes coming from your two separate parents or two similar collections of genes arranged on two complete sets of chromosomes
Final answer:
Homologous chromosomes are pairs of chromosomes that contain the same genes in the same order, but may have different alleles, leading to genetic diversity. Individuals inherit one chromosome from each parent, which contributes to traits like blood type or dimples, and can result in homozygous or heterozygous genotypes.
Explanation:
Understanding Homologous Chromosomes
When we speak of 'two homologous sets of genes,' we are referring to two related sets of genes that define our hereditary traits. Each person receives 23 chromosomes from each parent, for a total of 46. These chromosomes come in pairs, one from the mother and one from the father, and thus are described as homologous. Homologous chromosomes have the same genes arranged in the same order; however, they may carry different alleles, which are variations of these genes.
These different alleles contribute to the genetic diversity in humans. For instance, if we consider the gene responsible for blood type, a person may inherit two identical alleles, which would make them homozygous (e.g., AA, BB, OO), or two different alleles, making them heterozygous (e.g., AB). Genetic inheritance plays a crucial role starting at conception when the sperm and egg cell unite, each donating 23 chromosomes.
A straightforward example is the trait for dimples; a child can inherit the allele for dimples from one parent and an allele for no dimples from the other parent. This demonstrates how homologous chromosomes can carry different genetic information that affects the same trait and how this variation results in the diverse characteristics we observe.
When habitats are destroyed, specialized species are more likely than generalized species to _____.
adapt to change
migrate to new habitats
move into a new niche
become extinct
Answer: become extinct
A generalist species is able to thrive in a wide variety of climate and environmental conditions and have varied diets. When their habitats are destroyed, they can easily adapt to change, migrate or move into a new niche.
A specialist species can thrive only in a narrow range of climate and environmental conditions and has a limited diet. When this environment or habitat is destroyed, they are most likely to become extinct than the generalist species.
Answer:
become extinct
Explanation:
I had it on a quiz
Which of the following living things would be found closest to the beginning of a food chain? A. coyote B. caterpillar C. mushroom D. scorpion
Answer:
It is B. Caterpillar
Explanation:
The living thing would be found closest to the beginning of a food chain is caterpillar.
Which organism in this food web is an omnivore?Omnivores typically occupy the third trophic level alongside meat-eating carnivores.
Omnivores are a mixed group of creatures.
Examples of omnivores include bears, birds, dogs, raccoons, foxes, certain insects, and even humans.
Thus, option "B" is correct, is found closest to the bengining of a food chain is caterpillar.
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The tendency for one extreme phenotype, such as large size or extreme coloration, to be favored over average phenotypes is called
The answer is disruptive selection. The allelic frequency of the population shifts to the extreme traits that are being favoured by natural selection as opposed to the intermediate traits. The variance in the population increases and two species begin to emerge. Directional selection, on the other, favours one end of the extreme traits. Disruptive selection is a form of sympatric speciation.
Directional selection
A directional selection is the tendency for an extreme phenotype such as large size or extreme coloration to be favored over other phenotypes. Direct selection allows the favored or selected allele to increase as a result of differences in survival and reproduction among different phenotypes.
An animal emits a response in the presence of a certain tone. if a slightly higher pitched tone elicits the same response, then stimulus _______ has taken place
Black fur(b) in guinea pigs is dominant over white fur(b). find the probability of a hybrid offspring in the cross: bb x bb. 0% 25% 50% 75% 100%
Answer:
The correct answer is 75%
Explanation:
I just had this question and got it right.