Answer the following question given this paragraph: Molecules are groups of atoms that behave as a single unit. Q: What are groups of atoms that behave as a single unit called? Choices: - protons - particles - ions - molecules A:
molecules
(Question)
Answer the following question given this paragraph: There are billions of bacteria inside the human digestive tract. They help us digest food. They also make vitamins and play other important roles. We use bacteria in many other ways as well. For example, we use them to:. Q: Billions of what inside the human digestive tract help us digest food, make vitamins and play other important roles? Choices: - neurons - viruses - red blood cells - bacteria A:
(Answer)
bacteria
Ques: Answer the following question given this paragraph: Respiratory System: Respiratory Distress Syndrome Respiratory distress syndrome (RDS) primarily occurs in infants born prematurely. Up to 50 percent of infants born between 26 and 28 weeks and fewer than 30 percent of infants born between 30 and 31 weeks develop RDS. RDS results from insufficient production of pulmonary surfactant, thereby preventing the lungs from properly inflating at birth. A small amount of pulmonary surfactant is produced beginning at around 20 weeks; however, this is not sufficient for inflation of the lungs. As a result, dyspnea occurs and gas exchange cannot be performed properly. Blood oxygen levels are low, whereas blood carbon dioxide levels and pH are high. The primary cause of RDS is premature birth, which may be due to a variety of known or unknown causes. Other risk factors include gestational diabetes, cesarean delivery, second-born twins, and family history of RDS. The presence of RDS can lead to other serious disorders, such as septicemia (infection of the blood) or pulmonary hemorrhage. Therefore, it is important that RDS is immediately recognized and treated to prevent death and reduce the risk of developing other disorders. Medical advances have resulted in an improved ability to treat RDS and support the infant until proper lung development can occur. At the time of delivery, treatment may include resuscitation and intubation if the infant does not breathe on his or her own. These infants would need to be placed on a ventilator to mechanically assist with the breathing process. If spontaneous breathing occurs, application of nasal continuous positive airway pressure (CPAP) may be required. In addition, pulmonary surfactant is typically administered. Death due to RDS has been reduced by 50 percent due to the introduction of pulmonary surfactant therapy. Other therapies may include corticosteroids, supplemental oxygen, and assisted ventilation. Supportive therapies, such as temperature regulation, nutritional support, and antibiotics, may be administered to the premature... Q: Respiratory distress syndrome results from insufficient production of what? Choices: - carbon dioxide - alveoli - lung tissue - pulmonary surfactant A:
Ans: pulmonary surfactant
(Q).
Answer the following question given this paragraph: Waves are identified by several characteristics. There is a center line where the medium would be if there were no wave, which is sometimes describes as the undisturbed position. The displacement of the medium above this undisturbed position is called a crest and the displacement below the undisturbed position is called a trough . The maximums of the crest and trough are equal and are called the amplitude . The distance between equivalent positions on succeeding waves is called the wavelength . The wavelength could be measured from a crest to the next crest or from a trough to the next trough, and is commonly represented with the Greek letter lambda, . Q: Amplitude describes what about the wave's crest and trough? Choices: - The minimum parts - How frequently the parts occur - The width of the parts - the maximum parts A:
(A).
the maximum parts
Ques:Answer the following question given this paragraph: An obstacle or opening that is shorter than the wavelength causes greater diffraction of waves. Q: An obstacle or opening that is shorter than the wavelength causes greater diffraction of what? Choices: - tides - ranges - particles - waves A:

Ans:waves
Ques:Answer the following question given this paragraph: The speed of sound in air is approximately , where is the temperature of the air in Celsius. The speed of light is 300,000 km/sec, which means it travels from one place to another on Earth more or less instantaneously. Let's say on a cool night (air temperature Celsius) you see lightning flash and then hear the thunder rumble five seconds later. How far away (in km) did the lightning strike?. Q: What travels at a rate of 300,000 kilometers per second, or nearly instantaneously? Choices: - air - sound - gravity - light A:

Ans:
light