Biology

How did people acquired immunity to a disease before the development of vaccines
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An octopus reproduces only once in its life, but it may have more than 100,000 offspring, depending on the species. Certain species of penguin, by contrast, have only one chick at a time. If some species can reproduce as rapidly as the octopus (100,000 offspring every 3 or 4 years), how is it possible that a species that has only one young at a time is equally successful? A. Having a large number of offspring assures that at least some of them will escape being killed by predators. B. An octopus only reproduces one time, but penguins may reproduce between 4 and 12 times in their lives. C. Baby penguins are left to fend for themselves from the time they hatch, so they quickly become self-sufficient. D. The success of a species depends on the number of offspring that survive long enough to reproduce.
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The _____ is the place where the optic nerve fibers divide. As a result of this division, what we see in the left side of our vision is processed in the right side of the brain, and vice versa.
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A biologist conducted an experiment to determine the rate at which DNA mutations occur. The biologist was careful to record the steps of her experiment, as well as her observations and results. What should the biologist do next? A. Report her results in a scientific journal. B. Ask the local newspaper to publish her results. C. Hide her results from other scientists so that they won't steal her idea. D. Come up with a new hypothesis that she can test.
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Meselson and Stahl used density labeling of DNA to show that DNA replication occurs via a semiconservative mechanism. In their experiment, they started with an organism grown in a heavy density label (15N). After two generations of growth in light medium (the more common 14N isotope), if the DNA is isolated and separated by density, how many bands would be observed and how would their density compare with the starting DNA
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A BbGg x bbgg cross yields a phenotypic ratio of approximately 5 black eyes, green skin : 5 orange eyes, white skin : 1 black eyes, white skin : 1 orange eyes, green skin. Which of the following best explains these results?A.Mendel's laws of segregation and independent assortment are being violated.B.The heterozygous individual is male, and the homozygous individual is female.C.The genes for eye color and skin color are co-dominant.D.Mendel's law of independent assortment is being violated.E. Mendel's law of segregation is being violated.
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What are the characteristics of eukaryotic cells but not of prokaryotic cells?
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Storage forms of glucose in living things include _____.
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What product produced by yeast cells during fermentation causes bread to rise?lactic acidcarbon dioxideglucoseethyl alcohol
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Describe the interaction between bacteria and an antibiotic.Subject: Anatomy and Physiology
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Which aspect of this source should make the reader question its credibility?A. It is not written by an authority.B. It is not published in a major city.C. It was not written recently.D. It is a peer-reviewed journal.
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Which state of a dead body is caused by the lack of adenosine triphosphate (ATP) to the muscles?
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Some species of nitrogen-fixing bacteria have adapted to grow in nodules of legumes such as peas and clover. These bacteria make nitrogen available to the plant and in turn, receive nutrients from the tissues of the plant. This type of interaction is known as A) commensalism. B) hybridization. C) mutualism. D) parasitism.
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25. Select all accurate statements A. All chordates will have a notochord as adults B. All chordates have a ventral, hollow nerve cord C. All chordates have pharyngeal slits or clefts D. All chordates are bilaterally symmetrical animals. E. All chordates will have a muscular post an*l tail
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Help will mark as brainliest
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Lack of interaction with social and cultural environments transforms people into members of society.Please select the best answer from the choices providedOTOF
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Lucy plans to buy a refrigerator. She wants a large model so it has enough space for all the food she needs to store so that she takes fewer trips to the grocery store. Lucy also wants a refrigerator that does not use too much electricity. However, when she goes to the appliance store, she finds that larger refrigerators use more energy. Which statement best explains why there is NO perfect solution for Lucy's a. Lucy cannot choose the values of the variables.b. The two variables have to be calculated.c. There is a trade-off between the two variables.d. Lucy does not know which variable is more important.
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List 3 imperfections of the vertebrate eye?
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Water vapor will change state fromenergy has been removed,__toa t 100 C when heatOA) solid; gasOB) gas; solidO C) gas; liquidOD) liquid; gas
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compare a cat arm to a human arm in form
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These are the 13 different species of birds that are related in the Galapagos islands
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Victoria needs to work through the night to finish a project for class. Victoria is concerned she will be too sleepy so she drinks energy drinks throughout the night to keep her alert and awake.What are the affects of energy drink?
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the difference of the biomes of Kansas city and denver
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Edward Jenner noticed that the milkmaids who milked cows by hand often were infected with cowpox and that their infections were mild. He also noticed that these same milkmaids did not contract smallpox, which was a much more serious disease. He presumed that the cowpox infections prevented the milkmaids from contracting the much more serious disease of smallpox. Subsequently he began vaccinating people with the pus-like material from cowpox lesions to determine if his thinking was correct. In the story above, the underlined portion is a(n):____________ A. HypothesisB. ObservationC. TheoryD. Experiment
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