Answer the following question given this paragraph: Gases in the coma and tail of a comet reflect light from the Sun. Comets are very hard to see except when they have comas and tails. That is why they appear only when they are near the Sun. They disappear again as they move back to the outer solar system. Q: What parts of comets make them easy to see? Choices: - arcs and tails - novas and tails - craters and tails - comas and tails A:
comas and tails
Answer the following question given this paragraph: Predator species such as birds and spiders control insect pests. They reduce the need for chemical pesticides, which are expensive and may be harmful to human beings and other organisms. Q: Predators can replace what tool in agriculture. Choices: - harvesters - fertilizer - irrigators - pesticides A:
pesticides
Q: Answer the following question given this paragraph: Objects in motion that return to the same position after a fixed period of time are said to be in harmonic motion. Objects in harmonic motion have the ability to transfer some of their energy over large distances. They do so by creating waves in a medium. Imagine pushing up and down on the surface of a bathtub filled with water. Water acts as the medium that carries energy from your hand to the edges of the bathtub. Waves transfer energy over a distance without direct contact with the initial source. Since waves are disturbances in an existing medium, they are considered phenomena and not actual objects. Q: Objects in motion that return to the same position after a fixed period of time are said to be in what? Choices: - resonant motion - kinetic motion - homeostasis - harmonic motion A:
A: harmonic motion
Question: Answer the following question given this paragraph: Fungus-like protists are molds. They are absorptive feeders, found on decaying organic matter. They resemble fungi and reproduce with spores as fungi do. Examples of fungus-like protists include slime molds and water molds. Q: How do fungus-like protists such as slime molds reproduce? Choices: - photosynthesis - sexually - asexually - with spores A:
Answer: with spores
*Question*
Answer the following question given this paragraph: There are 6 elements in this reaction. All of the monatomic ions have oxidation numbers equal to their charges. Additionally, we can assign an oxidation state of -2 to each oxygen atom and +1 to each hydrogen atom. Now, we just need to assign the oxidation states of manganese in MnO 4 - , nitrogen in the nitrite and nitrate ions, and sulfur in the sulfate ion. These can be determined by choosing a value for which all of the oxidation states in the ion add up to its overall charge. For example, in the nitrite ion:. Q: All of the monatomic ions have oxidation numbers equal to their? Choices: - atomic number - shape - atomic weight - charges A:
**Answer**
charges
(Q).
Answer the following question given this paragraph: atoms held together by covalent bonds; they tend to be very hard and have high melting points. Metallic solids have unusual properties: in addition to having high thermal and electrical conductivity and being malleable and ductile, they exhibit luster, a shiny surface that reflects light. An alloy is a mixture of metals that has bulk metallic properties different from those of its constituent elements. Alloys can be formed by substituting one metal atom for another of similar size in the lattice (substitutional alloys), by inserting smaller atoms into holes in the metal lattice (interstitial alloys), or by a combination of both. Although the elemental composition of most alloys can vary over wide ranges, certain metals combine in only fixed proportions to form intermetallic compounds with unique properties. Q: An alloy is a mixture of metals that has bulk metallic properties different from those of its what? Choices: - system elements - nuclear elements - mineral elements - constituent elements A:
(A).
constituent elements