Biology

What are some reasons why the control of insect pests is difficult?
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Which statement is not true about the field of science?it is based on observations and explanations of the natural world.
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A scientist makes a discovery that suggests a hominid species created and used relatively sophisticated tools. The scientist decided to publish his findings. Which of the following sources would be regarded as the most reliable?
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In Gregor Mendel's work with pea plants, he found that when a tall pea plant, with genes TT, was crossed with a short pea plant, with genes tt, that _____ % of the first generation of offspring plants were _____.
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The cell membrane regulates what enters and leaves the cell, only allowingcertain things to enter or exit. This is called:A:Selective PermabilityB:Homeostasis C:OsmosisD:Transport
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Explain two ways in which mitosis is biological significant
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Which of the following structures contain the highest conc of RNA..A) Centriole B) Lysosome C) Chromosome D) Nucleolus
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Match the following: 1. the continuous movement of water between the Earth's surface and the atmosphere lead 2. pollutes water sources by dumping wastes in rivers, streams, and oceans putrefaction 3. the leading cause of water contamination in countries without water treatment plants stimulants 4. a source of water pollution caused by the overuse of pesticides and fertilizers humoral immunity 5. caused by an overabundance of organic matter in water supplies agriculture 6. the decomposition of organic matter by microorganisms hydrological cycle 7. a chemical pollutant that can enter the water cycle through agricultural or domestic use bacterial infection 8. can cause the contamination of underground water supplies if poured on the ground industry 9. a metal that leaks into water supplies via the soil or aging water systems eutrophication 10. depends upon the production of disease-specific antibodies to destroy harmful bacteria sewage 11. increases the activity of the central nervous system petroleum 12. reduces the activity of the central nervous system pesticides 13. caused by the reproduction of a small infectious agent, which produces poisons that destroy cells depressants
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Identify the four key concepts of Darwin's theory of natural selection. (2 marks)Explain how Lamarck's theory was different and why it got rejected over time. (2 marks)
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Nguyn nhn gy bnh qung g ngi l do:u
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A thermometer is placed in water in order to measure the waters temperature. What would cause the liquid in the thermometer to drop?
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One moth population carries three alleles at a genetic locus: X1, X2and X3. X1is dominant to X2and X3; X1produces red antennae. X2is co-dominant to X3; X2X2produces yellow antennae, X3X3produces white antennae, and X2X3produces light yellow antennae. The phenotypes in a population are as follows: 0.04 white; 0.16 light yellow; 0.16 yellow; 0.64 red.Assuming that this population is in Hardy-Weinberg equilibrium, what is the frequency of the X3allele in this population
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what is the average lifespan of a sperm cell
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Skeletal muscle is controlled by the organism.Which best describes what this means in terms of movement?
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Which Statement isna conclusion?A. It's better to give people balloons than cut flowers that will die.?B. Florist Put cut flowers in sugar water, so flowers in sugar water stay fresh longer?C. How can cut flowers stay fresh for a longer period of time?D. cut flowers placed in sugar water fresh longer than flowers placed in regular water.
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Anaerobic Respiration of Yeast1. Describe at least one part of the experiment procedure you thought wasessential for getting good results. Did you find that certain steps in theprocedure had to be followed carefully to get consistent results? If you wantedbetter results, do you think there is a step that could have been added to theprocedure?2. Discuss your thoughts on the overall lab design. Did it help you understand theconcepts better, or did it raise more questions? Do you think you could havedesigned a better experiment? If so, explain how and then discuss it with yourclassmates. Share some of your knowledge with them to learn a little moreabout this experiment.
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Define the word BiosphereTHANK YOU!! :)
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When calcium carbonate is heated, itdecomposes into calcium oxide and carbondioxide. If 100 g of calcium carbonate aredecomposed, 56 g of calcium oxide is produced.What would be the mass of the carbon dioxidegiven off by the decomposition?A. 448B. 110 gC. 156 g
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The rate of capillary filtration and reabsorption are increased when......... .A) the negative pressure of interstitial fluid is reducedB) the pressure of oxygen available to tissues is decreased C) intravenous pressure is increased
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Which biome does this photograph represent?
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how many types does the larva of silkworm moult?
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what is the difference of biology and human and social biology ???
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Individuals with a mutation in the gene for apolipoprotein B-100 produce very low levels of this protein, which is a component of LDL. How would accumulation of fat in the liver be affected and would this result in hypercholesterolemia or hypercholesterolemia
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What is the main cellular structure involved in respiration?
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