Answer the following question given this paragraph: Vertebrates have a closed circulatory system with a heart. Blood is completely contained within blood vessels that carry the blood throughout the body. The heart is divided into chambers that work together to pump blood. There are between two and four chambers in the vertebrate heart. With more chambers, there is more oxygen in the blood and more vigorous pumping action. Q: Leaves respond to these environmental stimuli by producing less what? Choices: - oxygen - carbonate - energy - chlorophyll A:
chlorophyll
Answer the following question given this paragraph: Wine, air, and gunpowder are other examples of common homogeneous mixtures ( Figure below ). Their exact compositions can vary, making them mixtures rather than pure substances. Wine is a liquid mixture of water, ethanol, and a variety of other dissolved substances. Air is a mixture of nitrogen gas (78%), oxygen gas (21%), and small amounts of various other gases. Gunpowder is a solid mixture comprised of potassium nitrate (75%), charcoal (15%) and sulfur (10%). Q: Wine, air, and gunpowder are all examples of what kind of common mixtures? Choices: - combined - contiguous - heterogeneous - homogeneous A:
homogeneous
Q: Answer the following question given this paragraph: What is physics ? Physics is the branch of science that studies the physical world, including objects as small as subatomic particles and as large as galaxies. It studies the nature of matter and energy and how they interact. Physicists are inquisitive people who want to know the causes of what they see. How does the moon move? Why does the moon move? Why do the stars shine? Why do your hands get warm when you rub them together? Physicists, like all scientists, hope to find explanations that describe more than one phenomenon and offer a better understanding of how the universe works. Q: What is the branch of science that studies the physical world? Choices: - social science - botany - Ecology - physics A:
A: physics
Question: Answer the following question given this paragraph: Hormones, chemical messengers used to communicate between cells, are important in regulating digestion. Q: What are the chemical messengers used to communicate between cells? Choices: - membranes - peptides - neurons - hormones A:
Answer: hormones
*Question*
Answer the following question given this paragraph: A storm is an episode of severe weather. It is caused by a major disturbance in the atmosphere. Types of storms include thunderstorms, tornadoes, and hurricanes. Q: A major disturbance in what results in an episode of severe weather called a storm? Choices: - the oceans - the core - the ozone layer - the atmosphere A:
**Answer**
the atmosphere
(Q).
Answer the following question given this paragraph: By losing an electron, the sodium atom becomes a sodium ion. It now has more protons than electrons and a charge of +1. Positive ions such as sodium are given the same name as the element. The chemical symbol has a plus sign to distinguish the ion from an atom of the element. The symbol for a sodium ion is Na + . Q: Ions can be formed when atoms lose what other particles? Choices: - neutrons - protons - shells - electrons A:
(A).
electrons