Q: Pure constructive interference and pure destructive interference are distinguished by whether or not identical waves are what? Read this paragraph and choose the correct option from the provided answers: Figure 27.11 The amplitudes of waves add. (a) Pure constructive interference is obtained when identical waves are in phase. (b) Pure destructive interference occurs when identical waves are exactly out of phase, or shifted by half a wavelength. Choices: - before phase - in equilibrium - after phase - in phase A:
in phase

Q: What travels at a rate of 300,000 kilometers per second, or nearly instantaneously? Read this paragraph and choose the correct option from the provided answers: The speed of sound in air is approximately , where is the temperature of the air in Celsius. The speed of light is 300,000 km/sec, which means it travels from one place to another on Earth more or less instantaneously. Let's say on a cool night (air temperature Celsius) you see lightning flash and then hear the thunder rumble five seconds later. How far away (in km) did the lightning strike?. Choices: - air - sound - gravity - light A:
light

Q: Q: When cardiac muscle contracts, the heart does what? Read this paragraph and choose the correct option from the provided answers: Cardiac muscle is found only in the walls of the heart. It is striated, or striped, because its muscle fibers are arranged in bundles. Contractions of cardiac muscle are involuntary. This means that they are not under conscious control. When cardiac muscle contracts, the heart beats and pumps blood. Choices: - cardiac arrest - irregular heartbeat - heart murmur - pumps blood A:
A: pumps blood

Question: Q: What is typical weather for chicago in winter? Read this paragraph and choose the correct option from the provided answers: Cold and snow are typical for Chicago in the winter. Choices: - rain and wind - dry and windy - ice and humidity - cold & snow A:
Answer: cold & snow

*Question*
Q: For what kind of animal is communication essential? Read this paragraph and choose the correct option from the provided answers: Communication is any way that animals share information. Many animals live in social groups. For these animals, being able to communicate is essential. Communicating increases the ability of group members to cooperate and avoid conflict. Communication may help animals work together to find food and defend themselves from predators. It also helps them find mates and care for their offspring. In addition, communication helps adult animals teach the next generation learned behaviors. Therefore, communication generally improves the chances of animals surviving and reproducing. Choices: - anti-social animals - new born animals - migrating animals - social animals A:
**Answer**
social animals

Q: What kind of bees are most adult bees in a hive? Read this paragraph and choose the correct option from the provided answers: Most of the adult bees in a colony are workers. They cooperate to build the hive, collect food, and care for the young. Each worker has a specific task to perform, depending on its age. Young worker bees clean the hive and feed the offspring. Older worker bees build the waxy honeycomb or guard the hive. The oldest worker bees leave the hive to find food. Choices: - larvae - queens - drones - worker bees A:
worker bees