Answer the following question given this paragraph: Osteoporosis is a disease in which bones lose mass and become more fragile than they should be. Osteoporosis also makes bones more likely to break. Two of the easiest ways to prevent osteoporosis are eating a healthy diet that has the right amount of calcium and vitamin D and to do some sort of weight-bearing exercise every day. Foods that are a good source of calcium include milk, yogurt, and cheese. Non-dairy sources of calcium include Chinese cabbage, kale, and broccoli. Many fruit juices, fruit drinks, tofu, and cereals have calcium added to them. It is recommended that teenagers get 1300 mg of calcium every day. For example, one cup (8 fl. oz. ) of milk provides about 300 mg of calcium, or about 30% of the daily requirement. Q: What is the disease in which bones lose mass and become more fragile and likely to break? Choices: - arthritis - tuberculosis - fibrosis - osteoporosis A:
osteoporosis
Answer the following question given this paragraph: We obviously can't live without plants, but sometimes they cause us problems. Many plants are weeds. Weeds are plants that grow where people don't want them, such as gardens and lawns. They take up space and use resources, hindering the growth of more desirable plants. People often introduce plants to new habitats where they lack natural predators and parasites. The introduced plants may spread rapidly and drive out native plants. Many plants produce pollen , which can cause allergies. Plants may also produce toxins that harm human health (see Figure below ). Q: What are plants called that grow where you don't want them? Choices: - grasses - shrubs - reeds - weeds A:
weeds
Q: Answer the following question given this paragraph: 33.2 The Four Basic Forces The four basic forces and their carrier particles are summarized in the Table 33.1. Feynman diagrams are graphs of time versus position and are highly useful pictorial representations of particle processes. The theory of electromagnetism on the particle scale is called quantum electrodynamics (QED). Q: What do we call the theory of electromagnetism on the particle scale? Choices: - iron electrodynamics - light electrodynamics - gravity electrodynamics - quantum electrodynamics A:
A: quantum electrodynamics
Question: Answer the following question given this paragraph: Some predator species play a special role in their community. They are called keystone species. When the population size of a keystone species changes, the populations of many other species are affected. Prairie dogs, pictured in Figure below , are an example of a keystone species. Their numbers affect most of the other species in their community. Prairie dog actions improve the quality of soil and water for plants, upon which most other species in the community depend. Q: What do you call a predator species that affects other species' populations when its own population size changes? Choices: - paradox species - symbiotic species - complement species - keystone species A:
Answer: keystone species
*Question*
Answer the following question given this paragraph: Atmospheric pressure is the pressure exerted by gas particles in Earth's atmosphere as those particles collide with objects. A barometer is an instrument used to measure atmospheric pressure. A traditional mercury barometer consists of an evacuated tube immersed in a container of mercury. Air molecules push down on the surface of the mercury. Because the inside of the tube is a vacuum, the mercury rises inside the tube. The height to which the mercury rises is dependent on the external air pressure. Q: What type of pressure is the pressure exerted by gas particles in earth's atmosphere as those particles collide with objects? Choices: - vertical pressure - adjacent pressure - adjacent pressure - atmospheric pressure A:
**Answer**
atmospheric pressure
Answer the following question given this paragraph: Trophic level 3 = secondary consumers that eat primary consumers. Q: What trophic level are secondary consumers (which eat primary consumers) considered to be? Choices: - trophic level 5 - trophic level 4 - trophic level 2 - trophic level 3 A:
trophic level 3