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
Answer the following question given this paragraph: Floods may occur when deep snow melts quickly in the spring. More often, floods are due to heavy rainfall. Floods happen when rain falls more quickly than water can be absorbed into the ground or carried away by rivers or streams. Q: What occurs when rain falls more quickly than water can be absorbed into the ground or carried away by rivers or streams? Choices: - typhoons - greenhouse effect - landslides - floods A:
floods
Q: Answer the following question given this paragraph: Xylem and phloem are the two types of vascular tissues in vascular plants. Q: What are the two types of vascular tissues found in vascular plants? Choices: - xylem and chloroplasm - cytoplasm and chloroplasm - ectoderm and phloem - xylem and phloem A:
A: xylem and phloem
Question: Answer the following question given this paragraph: Light from objects at different distances is focused by the lens of the eye. Muscles in the eye control the shape of the lens so the light is focused on the back of the eye no matter how far the object is from the lens. Q: Light from objects at different distances is focused by what part of the eye? Choices: - iris - pupil - meniscus - lens A:
Answer: lens
*Question*
Answer the following question given this paragraph: Flagellates have long flagella, or tails. Flagella rotate in a propeller-like fashion, pushing the protist through its environment ( Figure below ). An example of a flagellate is Trypanosoma , which causes African sleeping sickness. Q: What type of pathogen is responsible for african sleeping sickness? Choices: - streptococcus - Trichinella spiralis - salmonella - trypanosoma A:
**Answer**
trypanosoma
Q: Answer the following question given this paragraph: Figure 9.3 This car is in dynamic equilibrium because it is moving at constant velocity. There are horizontal and vertical forces, but the net external force in any direction is zero. The applied force F app between the tires and the road is balanced by air friction, and the weight of the car is supported by the normal forces, here shown to be equal for all four tires. Q: When is a moving car said to be in dynamic equilibrium? Choices: - at rest - at homeostasis - when accelerating - zero net force A:
A: zero net force