*Question*
Q: Energy is absorbed in the process of converting a liquid at its boiling point into a what? Read this paragraph and choose the correct option from the provided answers: Energy is absorbed in the process of converting a liquid at its boiling point into a gas. As with the melting of a solid, the temperature of a boiling liquid remains constant and the input of energy goes into changing the state. The molar heat of vaporization of a substance is the heat absorbed by one mole of that substance as it is converted from a liquid to a gas. As a gas condenses to a liquid, heat is released. The molar heat of condensation of a substance is the heat released by one mole of that substance as it is converted from a gas to a liquid. Since vaporization and condensation of a given substance are the exact opposite processes, the numerical value of the molar heat of vaporization is the same as the numerical value of the molar heat of condensation, but opposite in sign. In other words, . Choices: - mesh - plasma - solid - gas A:
**Answer**
gas

*Question*
Q: Birds are thought to have evolved around 150 million years ago from what? Read this paragraph and choose the correct option from the provided answers: Birds are thought to have evolved from theropod dinosaurs around 150 million years ago. Choices: - teradactils - raptor dinosaurs - parrot dinosaurs - theropod dinosaurs A:
**Answer**
theropod dinosaurs

*Question*
Q: The union of gametes is called? Read this paragraph and choose the correct option from the provided answers: Sexual reproduction involves two parents. It produces offspring that are all genetically unique. It requires the production of haploid gametes. The union of gametes is called fertilization. It results in a diploid zygote. Choices: - pollination - migration - fusion - fertilization A:
**Answer**
fertilization

*Question*
Q: Every object is attracted to every other object by what force? Read this paragraph and choose the correct option from the provided answers: Every object is attracted to every other object by gravity. The force of gravity between two objects depends on the mass of the objects. It also depends on how far apart the objects are. When you are sitting next to your dog, there is a gravitational force between the two of you. That force is far too weak for you to notice. You can feel the force of gravity between you and Earth because Earth has a lot of mass. The force of gravity between the Sun and planets is also very large. This is because the Sun and the planets are very large objects. Gravity is great enough to hold the planets to the Sun even though the distances between them are enormous. Gravity also holds moons in orbit around planets. Choices: - weight - magnetism - pheromones - gravity A:
**Answer**
gravity