Answer the following question given this paragraph: A nerve impulse begins when a neuron receives a chemical stimulus. The impulse travels down the axon membrane as an electrical action potential to the axon terminal. The axon terminal releases neurotransmitters that carry the nerve impulse to the next cell. Q: What begins when a neuron receives a chemical stimulus? Choices: - a induce impulse - a metabolism impulse - nerve reaction - a nerve impulse A:
a nerve impulse
Answer the following question given this paragraph: Unsafe water supplies have drastic effects on human health. Waterborne diseases are diseases due to microscopic pathogens in fresh water. These diseases can be caused by protozoa, viruses, bacteria, and intestinal parasites. In many parts of the world there are no water treatment plants. If sewage or animal manure gets into a river, then people downstream will get sick when they drink the water. According to the World Health Organization (WHO), diarrheal disease is responsible for the deaths of 1.8 million people every year. It was estimated that 88% of the cases of diarrheal disease are caused by unsafe water supplies. Q: What type of contamination causes almost 90% of diarrheal disease worldwide? Choices: - air contamination - ground contamination - food contamination - water supply contamination A:
water supply contamination
Q: Answer the following question given this paragraph: The visceral mass in the shelled species is characteristically twisted and the foot is modified for crawling. Most gastropods bear a head with tentacles that support eyes. A complex radula is used to scrape food particles from the substrate. The mantle cavity encloses the ctenidia as well as a pair of nephridia. The class Cephalopoda ("head foot" animals) includes octopuses, squids, cuttlefish, and nautilus. Cephalopods include shelled and reduced-shell groups. They display vivid coloration, typically seen in squids and octopuses, which is used for camouflage. The ability of some octopuses to rapidly adjust their colors to mimic a background pattern or to startle a predator is one of the more awe-inspiring feats of these animals. All animals in this class are predators and have beaklike jaws. All cephalopods have a well-developed nervous system, complex eyes, and a closed circulatory system. The foot is lobed and developed into tentacles and a funnel, which is used for locomotion. Suckers are present on the tentacles in octopuses and squid. Ctenidia are enclosed in a large mantle cavity and are serviced by large blood vessels, each with its own heart. Cephalopods (Figure 15.27) are able to move quickly via jet propulsion by contracting the mantle cavity to forcefully eject a stream of water. Cephalopods have separate sexes, and the females of some species care for the eggs for an extended period of time. Although the shell is much reduced and internal in squid and cuttlefish, and absent altogether in octopus, nautilus live inside a spiral, multi-chambered shell that is filled with gas or water to regulate buoyancy. Q: What class of animals, translated as "head foot", includes octopuses, squids, cuttlefish, and nautilus? Choices: - mollusks - crustaceans - bivalves - cephalopods A:
A: cephalopods
Question: Answer the following question given this paragraph: Terrestrial biomes are determined mainly by temperature and moisture. Plants are the primary producers. Examples of terrestrial biomes include tropical rainforests, temperate grasslands, and tundra. Q: What are terrestrial biomes determined by? Choices: - moisture and elevation - pressure and temperature - time and temperature - temperature and moisture A:
Answer: temperature and moisture
*Question*
Answer the following question given this paragraph: Science rests on evidence and logic, so it deals only with things that can be observed. An observation is anything that is detected either through human senses or with instruments and measuring devices that extend human senses. Things that cannot be observed or measured by current meanssuch as supernatural beings or eventsare outside the bounds of science. Consider these two questions about life on Earth:. Q: What term means anything that is detected either through human senses or with instruments and measuring devices that extend human senses? Choices: - variation - evaluation - evacuation - observation A:
**Answer**
observation
(Question)
Answer the following question given this paragraph: Staying balanced when riding a scooter requires control over the body's muscles. The nervous system controls the muscles and maintains balance. Q: What helps control the muscles and maintain balance? Choices: - circulatory system - muscular system - lymphatic system - nervous system A:
(Answer)
nervous system