Is it normal to miss a period for 2 months? About nine to 14 percent of women in the United States are affected by menstrual irregularities. With the exception of missing your period while on some contraceptives, it is not normal to go without a period for several months and can be harmful to your […]
What does salt solution do in DNA extraction?
What does salt solution do in DNA extraction? The salt neutralizes the negative charges on the DNA and thus enables the DNA strands to stick together. It also causes proteins and carbohydrates to precipitate. Why is a saline solution used for isolating cheek cells? Why the salt water? In this protocol, the aim is to […]
What are the waves of the electronic spectrum?
What are the waves of the electronic spectrum? The electromagnetic spectrum includes, from longest wavelength to shortest: radio waves, microwaves, infrared, optical, ultraviolet, X-rays, and gamma-rays. What type of wave is magnetic? Electromagnetic waves are waves that consist of vibrating electric and magnetic fields. Like other waves, electromagnetic waves transfer energy from one place to […]
What happened in 1989 with the Cold War?
What happened in 1989 with the Cold War? The Cold War finally came to an end in 1989 with the fall of the Berlin Wall and the collapse of the Communist regimes in Eastern Europe. What happened to the Soviet Union in 1989? Gorbachev’s decision to loosen the Soviet yoke on the countries of Eastern […]
How long is playtime at school?
How long is playtime at school? Playtime length at primary schools worldwide varies from just 15 minutes to over two hours, in school days that vary from 3.5 hours to over ten. The types of playgrounds children have varied worldwide, from hard courts to landscaped parks. Should kids have less school hours? Shorter school days […]
What type of concept is evolution?
What type of concept is evolution? In biology, evolution is the change in the characteristics of a species over several generations and relies on the process of natural selection. The theory of evolution is based on the idea that all species? are related and gradually change over time. Is evolution a concept? Evolution by natural […]
Is a fish a producer consumer or a decomposer?
Is a fish a producer consumer or a decomposer? The food-chain includes the producer, primary consumer, secondary consumer and decomposers. Diatoms are a major group of algae, and are among the most common types of phytoplankton so are the producers, crustacean belongs to primary consumer, fish is secondary consumer, seal is tertiary and bacteria are […]
What are the impacts of anticyclone?
What are the impacts of anticyclone? The descent and warming of the air in an anticyclone might be expected to lead to the dissolution of clouds and the absence of rain. Near the centre of the anticyclone, the winds are light and the air can become stagnant. Air pollution can build up as a result. […]
How has North America affected their environment?
How has North America affected their environment? Explanation: Lumbering & forest exploitation is quite common in North America. Every year the unethical breakdown of forests by lumbering companies devastates the environment. The environmental effects of illegal logging include the biodiversity loss, deforestation, & the emission of greenhouse gases. How was North America developed? North America […]
What are the basic radar arrangements?
What are the basic radar arrangements? Basic Principle of Radar As shown in the figure, Radar mainly consists of a transmitter and a receiver. It uses the same Antenna for both transmitting and receiving the signals. The function of the transmitter is to transmit the Radar signal in the direction of the target present. What […]