Answer the following question given this paragraph: Wild male and female Sockeye salmon before spawning. Sockeye salmon are blue tinged with silver in color while living in the ocean. Just prior to spawning, both sexes turn red with green heads. Sockeye spawn mostly in streams having lakes in their watershed. The young fish spend up to three years in the freshwater lake before migrating to the ocean. Migratory fish spend from one to four years in salt water, and thus are four to six years old when they return to spawn. Navigation to the home river is thought to be done using the characteristic smell of the stream, and possibly the sun. Q: Both sexes of sockeye salmon turn red with green heads just prior to what? Choices: - dying - feeding - migrating - spawning A:
spawning
Answer the following question given this paragraph: The lithosphere-asthensophere divisions are based on mechanical properties. Q: The lithosphere-asthensophere divisions are based on what? Choices: - mechanical compounds - elemental properties - constant properties - mechanical properties A:
mechanical properties
Q: Answer the following question given this paragraph: Protozoa are single-celled eukaryotes that share some traits with animals. Q: Single-celled eukaryotes that share some traits with animals are also called? Choices: - prokaryotes - monomers - microorganisms - eukaryotes A:
A: eukaryotes
Question: Answer the following question given this paragraph: Echinoderms lack respiratory and excretory systems. Instead, the thin walls of their tube feet allow oxygen to diffuse in and wastes to diffuse out. Echinoderms also lack a centralized nervous system. They have an open circulatory system and lack a heart. On the other hand, echinoderms have a well-developed coelom and a complete digestive system. Echinoderms use pheromones to communicate with each other. They detect the chemicals with sensory cells on their body surface. Some echinoderms also have simple eyes ( ocelli ) that can sense light. Like annelids, echinoderms have the ability to regenerate a missing body part. Q: Echinoderms lack what type of system that in humans consists of the brain and spinal cord? Choices: - autonomic system - endocrine system - peripheral nervous system - centralized nervous system A:
Answer: centralized nervous system
*Question*
Answer the following question given this paragraph: Q: What organs absorb water and nutrients from the soil? Choices: - flowers - buds - leaves - roots A:
**Answer**
roots
Answer the following question given this paragraph: Perhaps the most familiar liquid-solid solution is dental amalgam, used to fill teeth when there is a cavity. Approximately 50% of the amalgam material is liquid mercury to which a powdered alloy of silver, tin and copper is added. Mercury is used because it binds well with the solid metal alloy. However, the use of mercury-based dental amalgam has gone under question in recent years because of concerns regarding the toxicity of mercury. Q: The use of mercury-based dental amalgam has gone under question in recent years because of concerns regarding what? Choices: - the expense - the oxygen - the variability - the toxicity A:
the toxicity