Answer the following question given this paragraph: Density is an important physical property of matter. It reflects how closely packed the particles of matter are. When particles are packed together more tightly, matter has greater density. Differences in density of matter explain many phenomena, not just why helium balloons rise. For example, differences in density of cool and warm ocean water explain why currents such as the Gulf Stream flow through the oceans. You can see a colorful demonstration of substances with different densities at this URL:. Q: What term describes how closely packed the particles of matter are? Choices: - range - mass - space - density A:
density
Answer the following question given this paragraph: Group 13 is called the boron group, and boron is the only metalloid in this group. The other group 13 elements are metals. Q: What is the only metalloid in group 13? Choices: - phosphorus - gallium - alluminum - boron A:
boron
Q: Answer the following question given this paragraph: Particles from the Sun energize ions in the thermosphere. This creates the northern and southern lights. Q: What colorful phenomenon occurs in the northern sky when particles from the sun energize ions in the thermosphere? Choices: - meteor shower - Coriolis effect - aurora nervosa - northern lights A:
A: northern lights
Question: Answer the following question given this paragraph: Sperm are male gametes that form in the testes and mature in the epididymis. Q: What is defined as male gametes that form in the testes and mature in the epididymis? Choices: - plasma - mucus - stereocilia - sperm A:
Answer: sperm
*Question*
Answer the following question given this paragraph: You already know that a sour taste is one property of acids. ( Warning : Never taste an unknown substance to see whether it is an acid!) Acids have certain other properties as well. For example, acids can conduct electricity when dissolved in water because they consist of charged particles in solution. (Electric current is a flow of charged particles. ) Acids can also react with metals, and when they do they produce hydrogen gas. An example of this type of reaction is hydrochloric acid reacting with the metal zinc (Zn). The reaction is pictured in the Figure below . It can be represented by the chemical equation:. Q: Acids can also react with metals, and when they do they produce what? Choices: - alloys - potassium gas - rust - hydrogen gas A:
**Answer**
hydrogen gas
Answer the following question given this paragraph: Curvatures of the Vertebral Column The adult vertebral column does not form a straight line, but instead has four curvatures along its length (see Figure 7.20). These curves increase the vertebral column's strength, flexibility, and ability to absorb shock. When the load on the spine is increased, by carrying a heavy backpack for example, the curvatures increase in depth (become more curved) to accommodate the extra weight. They then spring back when the weight is removed. The four adult curvatures are classified as either primary or secondary curvatures. Primary curves are retained from the original fetal curvature, while secondary curvatures develop after birth. Q: What feature of the spine helps with flexibility and strength? Choices: - shape - angle - arrangement - curves A:
curves