Rather, pollution promoted the survival of dark forms on soot-covered trees. Melanics were normally quickly eliminated in nonindustrial areas by adverse selection; birds spotted them easily. This phenomenon, an increase in the frequency of dark-colored mutants in polluted areas, is known as ...
The subject-matter of the application relates to a device in which a high-frequency clock signal (CLK8) can be converted to a low-frequency clock signal (CLK5) whereby a strobe signal (STI) is shifted through a shift register (Reg 1...Reg 8) and, depending upon the output signals (...
To use an op-amp at high frequency, it is necessary to take two factors into consideration: slew rate and Unity Gain Cross Frequency (fT). If the slew rate is low for the frequency used, the square wave will become a trapezoidal wave and the sine...
Visible light has a higher frequency than infrared radiation. Frequency is inversely proportional to wavelength, which is the distance between wave...Become a member and unlock all Study Answers Start today. Try it now Create an account Ask a question Our experts can answer your tough ...
21. In paragraph 1, the weather in Texas is mentioned to A. forecast a policy shift in Texas schools. B. stress the consequences of climate change. C. indicate the atmosphere at the board meeting. D. draw the public's attention to energy shortages. ...
we have been discussing with your trade union representatives our intention to change the frequency of the payment of your salary from monthly to every four weeks. The reason for this change is to enable us to improve the efficiency of the payroll system and to make it easier for you to un...
For example, the Large Hadron Collider is housed at CERN in Geneva, Switzerland.Answer and Explanation: The factors on which a cyclotron frequency depends are quantity of matter, number of turns per period, and the velocity factor. These three things all......
effectiveness is likely to depend on multiple factors, some of which are beyond UNCTAD’s control. daccess-ods.un.org 此外,这种影响和效力有可能取决于多 种 因素, 有 些不 在贸发会议的控制范 围之内。 daccess-ods.un.orgLand and property prices are influenced by a complex of factors many ...
A.does not help save energy any moreB.is not so environmental friendly as beforeC.consumes most of the nation"s electricityD.has ruined its own green reputation 点击查看答案&解析手机看题 单项选择题 It seems to happen with depressing frequency—sunny skies turn to rain just as the weekend ar...
Problems of gene action, mutagenesis and recombination have been widely studied in microorganisms but little has been done with poly- genic systems. Genetic variability must exist for a selection program to be effective, but storage of variability in heterozygotes is not possible in haploids. ...