Q: Answer the following question given this paragraph: Veins are blood vessels that carry blood toward the heart. This blood is no longer under pressure, so veins have thinner walls. To keep the blood moving, many veins have valves that prevent the backflow of blood. Veins generally carry oxygen-poor blood. The smallest veins are called venules. They merge to form larger and larger veins. The largest vein is the inferior vena cava, which carries blood from the lower body directly to the heart. Q: What are the blood vessels that carry blood toward the heart and tend to have thinner walls? Choices: - capillaries - glands - clots - veins A:
A: veins

Q: Answer the following question given this paragraph: Some rocks contain little compasses too! As lava cools, tiny iron-rich crystals line up with Earth's magnetic field. Anywhere lavas have cooled, these magnetite crystals point to the magnetic poles. The little magnets point to where the north pole was when the lava cooled. Scientists can use this to figure out where the continents were at that time. This evidence clearly shows that the continents have moved. Q: As lava cools, tiny iron-rich crystals line up with earth's what? Choices: - gravitational field - oceans - molecular field - magnetic field A:
A: magnetic field

Q: Answer the following question given this paragraph: Boron neutron capture therapy is a potential treatment for many diseases. As the name implies, when boron10, one of the naturally occurring isotopes of boron, is bombarded with neutrons, it absorbs a neutron and emits an particle. Write a balanced nuclear reaction for this reaction. One advantage of this process is that neutrons cause little damage on their own, but when they are absorbed by boron-10, they can cause localized emission of alpha radiation. Comment on the utility of this treatment and its potential difficulties. Q: When boron10 absorbs a neutron, what does it emit? Choices: - calcium - light - proteins - particle A:
A: particle

Q: Answer the following question given this paragraph: Living things consist of matter, which can be an element or a compound. A compound consists of two or more elements and forms as a result of a chemical reaction. Q: What consists of two or more elements and forms as a result of a chemical reaction? Choices: - molecule - particle - protein - compound A:
A: compound