Answer the following question given this paragraph: The layers of the atmosphere are divided by their temperature gradients. The lowest layer is the troposphere. All weather takes place in this layer. The next layer is the stratosphere. The stratosphere contains the protective ozone layer. More sunlight strikes at the Equator than at the poles. This is what drives the global winds. Warm air rises, moves poleward, and then sinks when it meets with air moving toward the Equator. The result is six atmospheric circulation cells around the world. There are three cells in each hemisphere. Pollutants enter the atmosphere from a few sources. The most important is fossil fuel burning. Air pollution has bad effects on the environment and on human health. By reducing fossil fuel use we can make the environment cleaner. When ozone depletion was found to be a problem, the world acted. As a result, the ozone hole has stabilized. The hole will be getting smaller over the next decades. Q: How are layers of the atmosphere divided? Choices: - air gradients - color gradients - density gradients - temperature gradients A:
temperature gradients

Answer the following question given this paragraph: Near the time of birth, the amniotic sac breaks in a gush of fluid. Labor usually begins within a day of this event. Labor involves contractions of the muscular walls of the uterus, which cause the cervix to dilate. With the mother's help, the contractions eventually push the fetus out of the uterus and through the vagina. Within seconds of birth, the umbilical cord is cut. Without this connection to the placenta, the baby cannot exchange gases, so carbon dioxide quickly builds up in the baby's blood. This stimulates the brain to trigger breathing, and the newborn takes its first breath. Q: During labor, what do contractions of the muscular walls of the uterus cause? Choices: - spontaneous abortion - excretion - premature birth - cervical dilation A:
cervical dilation

Answer the following question given this paragraph: Pressure, volume, and temperature are related by the combined gas law. Q: Pressure, volume, and temperature are related by which law? Choices: - Law of Conservation - law of inertia - Murphy's Law - gas law A:
gas law

Answer the following question given this paragraph: Sensory-Somatic Nervous System The sensory-somatic nervous system is made up of cranial and spinal nerves and contains both sensory and motor neurons. Sensory neurons transmit sensory information from the skin, skeletal muscle, and sensory organs to the CNS. Motor neurons transmit messages about desired movement from the CNS to the muscles to make them contract. Without its sensorysomatic nervous system, an animal would be unable to process any information about its environment (what it sees, feels, hears, and so on) and could not control motor movements. Unlike the autonomic nervous system, which has two synapses between the CNS and the target organ, sensory and motor neurons have only one synapseone ending of the neuron is at the organ and the other directly contacts a CNS neuron. Acetylcholine is the main neurotransmitter released at these synapses. Humans have 12 cranial nerves, nerves that emerge from or enter the skull (cranium), as opposed to the spinal nerves, which emerge from the vertebral column. Each cranial nerve is accorded a name, which are detailed in Figure 35.28. Some cranial nerves transmit only sensory information. For example, the olfactory nerve transmits information about smells from the nose to the brainstem. Other cranial nerves transmit almost solely motor information. For example, the oculomotor nerve controls the opening and closing of the eyelid and some eye movements. Other cranial nerves contain a mix of sensory and motor fibers. For example, the glossopharyngeal nerve has a role in both taste (sensory) and swallowing (motor). Q: Motor neurons and sensory neurons are part of what nervous system? Choices: - peripheral - central - autonomic - sensory-somatic A:
sensory-somatic