Answer the following question given this paragraph: Primary Producers/Food Sources Protists are essential sources of nutrition for many other organisms. In some cases, as in plankton, protists are consumed directly. Alternatively, photosynthetic protists serve as producers of nutrition for other organisms. For instance, photosynthetic dinoflagellates called zooxanthellae use sunlight to fix inorganic carbon. In this symbiotic relationship, these protists provide nutrients for coral polyps (Figure 23.29) that house them, giving corals a boost of energy to secrete a calcium carbonate skeleton. In turn, the corals provide the protist with a protected environment and the compounds needed for photosynthesis. This type of symbiotic relationship is important in nutrient-poor environments. Without dinoflagellate symbionts, corals lose algal pigments in a process called coral bleaching, and they eventually die. This explains why reefbuilding corals do not reside in waters deeper than 20 meters: insufficient light reaches those depths for dinoflagellates to photosynthesize. Q: Without dinoflagellate symbionts, corals lose algal pigments in a process called coral bleaching and eventually die, while corals in turn provide protection, making this what type of relationship?. Choices: - idealistic - semantic - parasitic - symbiotic A:
symbiotic
Answer the following question given this paragraph: the fact that stars are made up of very lightweight hydrogen gas. Q: What type of gas are stars made up of? Choices: - water vapor - freon - calcium - hydrogen A:
hydrogen
Q: Answer the following question given this paragraph: Conduction is the transfer of thermal energy between particles of matter that are touching. Thermal conductors are materials that are good conductors of thermal energy. Thermal insulators are materials that are poor conductors of thermal energy. Both conductors and insulators have important uses. Q: What is the transfer of thermal energy between particles of matter that are touching called? Choices: - convection - activation - radiation - conduction A:
A: conduction
Question: Answer the following question given this paragraph: Electric potential energy comes from the position of a charged particle in an electric field. For example, when two negative charges are close together, they have potential energy because they repel each other and have the potential to push apart. If the charges actually move apart, their potential energy decreases. Electric charges always move spontaneously from a position where they have higher potential energy to a position where they have lower potential energy. This is like water falling over a dam from an area of higher to lower potential energy due to gravity. Q: What kind of energy comes from the position of a charged particle in an electric field? Choices: - solar energy - mechanical energy - thermal energy - potential energy A:
Answer: potential energy
*Question*
Answer the following question given this paragraph: Discussion The minus sign indicates that acceleration is to the left. This sign is reasonable because the train initially has a positive velocity in this problem, and a negative acceleration would oppose the motion. Again, acceleration is in the same direction as the change in velocity, which is negative here. This acceleration can be called a deceleration because it has a direction opposite to the velocity. Q: Deceleration is the opposite of what? Choices: - stopping - stimulation - vibration - acceleration A:
**Answer**
acceleration
(Question)
Answer the following question given this paragraph: Over much of Earth's past, the climate was warmer than it is today. Picture in your mind dinosaurs roaming the land. They're probably doing it in a pretty warm climate! But ice ages also occurred many times in the past. An ice age is a period when temperatures are cooler than normal. This causes glaciers to spread to lower latitudes. Scientists think that ice ages occurred at least six times over the last billion years alone. How do scientists learn about Earth's past climates?. Q: What do you call a period when temperatures are cooler than normal, causing glaciers to spread? Choices: - polar age - earth age - thermal age - ice age A:
(Answer)
ice age