Answer the following question given this paragraph: Some animals change their depth by changing their density. Recall that things that are denser than their surroundings sink while those that are less dense than their surroundings float. Most fish have a swim bladder, a special sac that is filled with gases from their blood. When the fish's swim bladder is full, it is less dense than the surrounding water and the fish will rise towards the surface. Another property of water that affects lakes is the unique changes in density during phase changes. The density of most substances increases when a liquid becomes a solid. This is not so for water: Solid water is actually less dense than liquid water. It is for this reason that ice floats. Can you imagine a world where ice sank? Lakes would freeze from the bottom up, killing many fish. Frozen water in the Polar Regions would sink and change the ocean levels. The fact that ice floats is essential for the survival of many aquatic ecosystems and ultimately life on Earth. Besides the changes in density, there are other ways in which the phase changes of water have significant impacts. When water is trapped in small cracks in rocks, it will expand as it freezes and break up the rock causing weathering. The transpiration (evaporation) of water from a good-sized tree can move 1800 liters of water out of the ground in a single day. Sublimation, the phase change between solid and gas, is responsible for the formation of frost. As you can see, water has many special properties that make its role in nature unique. It is considered the "universal solvent" because its bipolar molecule enables it to dissolve a wide variety of substances. Water is the only substance that occurs naturally in all three states; solid, liquid, and gas. Water is truly a miracle for life!. Q: How do some animals change their depth? A:
OPTIONS:
- mass migration
- metamorphosis
- spontaneous mutations
- by changing their density

Answer: by changing their density

Question: Answer the following question given this paragraph: Some of the oldest evidence of evolution comes from embryology , the study of how organisms develop. An embryo is an animal or plant in its earliest stages of development. This means looking at a plant or animal before it is born or hatched. Centuries ago, people recognized that the embryos of many different species have similar appearances. The embryos of some species are even difficult to tell apart. Many of these animals do not differ much in appearance until they develop further. Q: The study of how organisms develop is known as? A:
OPTIONS:
- ethology
- botany
- physics
- embryology
Answer: embryology

input with options: Answer the following question given this paragraph: Q: Parasitism, mutualism, and commensalism are all examples of what type of biological relationship? A:
OPTIONS:
- adaptation
- reproduction
- evolution
- symbiosis
output: symbiosis

Q: Answer the following question given this paragraph: A change of state occurs whenever matter changes from one state to another. Changes of state are physical changes in matter. They are reversible changes that do not change matter's chemical makeup or chemical properties. Q: What do you call reversible changes that do not change matter's chemical makeup or chemical properties? A:

OPTIONS:
- potential changes
- element changes
- chemical changes
- physical changes

A: physical changes

input: OPTIONS:
- surge
- threshold
- frequency
- crest Now, answer this question: Answer the following question given this paragraph: Figure above also shows how the size of waves is measured. The highest point of a wave is the crest. The lowest point is the trough. The vertical distance between a crest and a trough is the height of the wave. Wave height is also called amplitude. The horizontal distance between two crests is the wavelength. Both amplitude and wavelength are measures of wave size. Q: The highest point of a wave is called? A:
A:
output: crest

Question: Answer the following question given this paragraph: About 75% of the tar sands in the world are in Venezuela and Alberta, Canada ( Figure below ). Large areas of land are degraded when tar sands are mined. A tremendous amount of waste rock is produced from mining tar sands. Q: Where are about 75% of the tar sands in the world located? A:
OPTIONS:
- china and onatrio, canada
- alberta, canada and peru
- venezuela and onatrio,canada
- venezuela and alberta, canada
Answer:
venezuela and alberta, canada