Q: The lungs are a series of ever-narrowing tubes that end in a myriad of tiny sacs called what? Read this paragraph and choose the correct option from the provided answers: Breathing certainly is a major contribution to your health! Without breathing, we could not survive. Curiously, the act of breathing itself is little more than an application of Boyle's law. The lungs are a series of ever-narrowing tubes that end in a myriad of tiny sacs called alveoli. It is in the alveoli that oxygen from the air transfers to the bloodstream and carbon dioxide from the bloodstream transfers to the lungs for exhalation. For air to move in and out of the lungs, the pressure inside the lungs must change, forcing the lungs to change volumejust as predicted by Boyle's law. The pressure change is caused by the diaphragm, a muscle that covers the bottom of the lungs. When the diaphragm moves down, it expands the size of our lungs. When this happens, the air pressure inside our lungs decreases slightly. This causes new air to rush in, and we inhale. The pressure decrease is slightonly 3 torr, or about 0.4% of an atmosphere. We inhale only 0.51.0 L of air per normal breath. Exhaling air requires that we relax the diaphragm, which pushes against the lungs and slightly decreases the volume of the lungs. This slightly increases the pressure of the air in the lungs, and air is forced out; we exhale. Only 12 torr of extra pressure is needed to exhale. So with every breath, our own bodies are performing an experimental test of Boyle's law. Choices: - brachii - testes - glands - alveoli A:
alveoli

Q: What effect, related to weather forecasting, occurs not only for sound but for any wave when there is relative motion between the observer and the source? Read this paragraph and choose the correct option from the provided answers: Mole-mole calculations are not the only type of calculations that can be performed using balanced chemical equations. Recall that the molar mass can be determined from a chemical formula and used as a conversion factor. We can add that conversion factor as another step in a calculation to make a molemass calculation, where we start with a given number of moles of a substance and calculate the mass of another substance involved in the chemical equation, or vice versa. For example, suppose we have the balanced chemical equation. Choices: - pulse - echo - precipitation - doppler A:
doppler

Q: Q: Matter can be described with what two encompassing types of properties? Read this paragraph and choose the correct option from the provided answers: Matter can be described with both physical properties and chemical properties. Choices: - velocity and energy - thermal and magnetic - color and distance - physical and chemical A:
A: physical and chemical

Question: Q: Blood volume increases substantially during pregnancy, so that by childbirth, it exceeds its preconception volume by 30 percent, or approximately what? Read this paragraph and choose the correct option from the provided answers: Circulatory System Changes Blood volume increases substantially during pregnancy, so that by childbirth, it exceeds its preconception volume by 30 percent, or approximately 12 liters. The greater blood volume helps to manage the demands of fetal nourishment and fetal waste removal. In conjunction with increased blood volume, the pulse and blood pressure also rise moderately during pregnancy. As the fetus grows, the uterus compresses underlying pelvic blood vessels, hampering venous return from the legs and pelvic region. As a result, many pregnant women develop varicose veins or hemorrhoids. Choices: - 2-3 liters - 3-5 liters - 0-1 liters - 1-2 liters A:
Answer: 1-2 liters

*Question*
Q: Fossils provide a window into the past. they are evidence for what? Read this paragraph and choose the correct option from the provided answers: Fossils provide a window into the past. They are evidence for evolution. Choices: - emergence - intelligent design - generation - evolution A:
**Answer**
evolution

Q: Q: Cnidarians have a simple digestive system with a single opening surrounded by what type of structures, which are used to capture prey? Read this paragraph and choose the correct option from the provided answers: The body of a cnidarian consists of two cell layers, ectoderm and endoderm. The cells surround a digestive cavity called the coelenteron (see Figure below ). Cnidarians have a simple digestive system. The single opening is surrounded by tentacles, which are used to capture prey. The tentacles are covered with nematocyst cells. Digestion takes place in the coelenteron. Nutrients are absorbed and gases exchanged through the cells lining this cavity. Fluid in the coelenteron creates a hydrostatic skeleton. Choices: - spines - antennae - claws - tentacles A:
A: tentacles