Answer the following question given this paragraph: Symbiosis Symbiotic relationships, or symbioses (plural), are close interactions between individuals of different species over an extended period of time which impact the abundance and distribution of the associating populations. Most scientists accept this definition, but some restrict the term to only those species that are mutualistic, where both individuals benefit from the interaction. In this discussion, the broader definition will be used. Commensalism A commensal relationship occurs when one species benefits from the close, prolonged interaction, while the other neither benefits nor is harmed. Birds nesting in trees provide an example of a commensal relationship (Figure 45.25). The tree is not harmed by the presence of the nest among its branches. The nests are light and produce little strain on the structural integrity of the branch, and most of the leaves, which the tree uses to get energy by photosynthesis, are above the nest so they are unaffected. The bird, on the other hand, benefits greatly. If the bird had to nest in the open, its eggs and young would be vulnerable to predators. Another example of a commensal relationship is the clown fish and the sea anemone. The sea anemone is not harmed by the fish, and the fish benefits with protection from predators who would be stung upon nearing the sea anemone. Q: What is the term for interactions between individuals of different species over an extended period of time which impact the abundance and distribution of the associating populations? Choices: - parasitic relationships - cooperative evolution - food chain - symbiotic relationships A:
symbiotic relationships

Answer the following question given this paragraph: Vertebrates. From the smallest of fish to us. One of the main features we all have in common is our backbone. The Vertebrates chapter describes the biological features of fish, amphibians, reptiles, birds, and mammals. Q: One of the main features all vetebrates have in common is what? Choices: - hard shell - brain - skeleton - backbone A:
backbone

Answer the following question given this paragraph: The control rods play an important role in the modulation of the nuclear chain reaction (usually a collision of a neutron with uranium). Each collision produces more neutrons than were present initially. If left unsupervised, the reaction would soon get out of control. Rods are commonly made of boron or a number of metals and metal alloys. The purpose of the control rods is to absorb neutrons to regulate the rate of the chain reaction so that the water does not overheat and destroy the reactor. Q: What play an important role in the modulation of the nuclear chain reaction? Choices: - radiation rods - control neutrons - particle rods - control rods A:
control rods

Answer the following question given this paragraph: For a fixed amount of gas at constant temperature, the volume is inversely proportional to its pressure. Q: If a fixed amount of gas maintains a perfectly inversely proportional relationship between volume and pressure, then what else must be constant about the gas? Choices: - density - friction - surface tension - temperature A:
temperature