Ques: Q: What type of waves start when a source of energy causes a disturbance in the medium? Read this paragraph and choose the correct option from the provided answers: Mechanical waves are waves that transfer energy through matter, called the medium. Mechanical waves start when a source of energy causes a disturbance in the medium. Types of mechanical waves include transverse, longitudinal, and surface waves. Choices: - fluid waves - mechanical currents - magnetic waves - mechanical waves A:
Ans: mechanical waves

Ques: Q: The light-sensing cells in the retina are called rods and what else? Read this paragraph and choose the correct option from the provided answers: The back of the eye is covered by a thin layer called the retina. This is where the image of the object normally forms. The retina consists of special light-sensing cells called rods and cones. Rods sense dim light. Cones sense different colors of light. Choices: - sensor cells - stents - light cells - cones A:
Ans: cones

Ques: Q: Energy is lost as heat between each trophic level due to the second law of what? Read this paragraph and choose the correct option from the provided answers: One major factor that limits the length of food chains is energy. Energy is lost as heat between each trophic level due to the second law of thermodynamics. Thus, after a limited number of trophic energy transfers, the amount of energy remaining in the food chain may not be great enough to support viable populations at yet a higher trophic level. The loss of energy between trophic levels is illustrated by the pioneering studies of Howard T. Odum in the Silver Springs, Florida, ecosystem in the 1940s (Figure 46.5). The primary producers generated 20,819 kcal/m2/yr (kilocalories per square meter per year), the primary consumers generated 3368 kcal/m2/yr, the secondary consumers generated 383 kcal/m2/yr, and the tertiary consumers only generated 21 kcal/m2/yr. Thus, there is little energy remaining for another level of consumers in this ecosystem. Choices: - reactions - particles - chemistry - thermodynamics A:
Ans: thermodynamics

Ques: Q: Strong, stable bonds between carbon atoms produce complex molecules containing chains, branches, and rings; the chemistry of these compounds is called what? Read this paragraph and choose the correct option from the provided answers: Summary 20.1 Hydrocarbons Strong, stable bonds between carbon atoms produce complex molecules containing chains, branches, and rings. The chemistry of these compounds is called organic chemistry. Hydrocarbons are organic compounds composed of only carbon and hydrogen. The alkanes are saturated hydrocarbonsthat is, hydrocarbons that contain only single bonds. Alkenes contain one or more carbon-carbon double bonds. Alkynes contain one or more carbon-carbon triple bonds. Aromatic hydrocarbons contain ring structures with delocalized electron systems. Choices: - animal chemistry - inorganic chemistry - nuclear chemistry - organic chemistry A:
Ans:
organic chemistry