Answer the following question given this paragraph: Sexual reproduction results in infinite possibilities of genetic variation. In other words, sexual reproduction results in offspring that are genetically unique. They differ from both parents and also from each other. This occurs for a number of reasons. Q: What kind of reproduction results in offspring that are genetically unique? Choices: - budding - fragmentation - asexual reproduction - sexual reproduction A:
sexual reproduction
Answer the following question given this paragraph: A chemical change occurs whenever matter changes into an entirely different substance with different chemical properties. A chemical change is also called a chemical reaction. Many complex chemical changes occur to produce the explosions of fireworks. An example of a simpler chemical change is the burning of methane. Methane is the main component of natural gas, which is burned in many home furnaces. During burning, methane combines with oxygen in the air to produce entirely different chemical substances, including the gases carbon dioxide and water vapor. You can watch some very colorful chemical changes occurring in the video at this URL:. Q: When matter changes into an entirely different substance with different chemical properties, what has occurred? Choices: - mechanical change - gaseous change - physical change - chemical change A:
chemical change
Q: Answer the following question given this paragraph: Q: What kind of reproduction, in general, relies on sets of cells that are precursors for eggs and sperm? Choices: - binary fission - fusion - asexual - sexual A:
A: sexual
Question: Answer the following question given this paragraph: Many glasses eventually crystallize, rendering them brittle and opaque. Modifying agents such as TiO 2 are frequently added to molten glass to reduce their tendency to crystallize. Why does the addition of small amounts of TiO2 stabilize the amorphous structure of glass?. Q: Many glasses eventually crystallize, rendering them brittle and this? Choices: - powdered - soft - molten - opaque A:
Answer: opaque
*Question*
Answer the following question given this paragraph: Today, some 1,200 species of birds are threatened with extinction by human actions. Humans need to take steps to protect this precious and important natural resource. What can you do to help?. Q: Around 1200 species of what broad animal group are currently at risk of extinction due to human activity? Choices: - mammals - reptiles - amphibians - birds A:
**Answer**
birds
Answer the following question given this paragraph: Did you ever hear an echo of your own voice? An echo occurs when sound waves bounce back from a surface that they can't pass through. The woman pictured here is trying to create an echo by shouting toward a large building. When the sound waves strike the wall of the building, most of them bounce back toward the woman, and she hears an echo of her voice. An echo is just one example of how waves interact with matter. Q: What is heard when sound waves bounce back from a surface that they can't pass through? Choices: - radio - ultrasound - loop - echo A:
echo