Answer the following question given this paragraph: A: Air in the atmosphere is a gaseous solution. It is a mixture that contains mainly nitrogen and oxygen gases, with very small amounts of several other gases. The circle graph in the Figure below shows the composition of air. Because air is a solution, it is homogeneous. In other words, no matter where you go, the air always contains the same proportion of gases that are shown in the graph. Q: Which two gases make up the bulk of earth's atmosphere? Choices: - carbon and oxygen - phosphorus and oxygen - nitrogen and argon - nitrogen and oxygen A:
nitrogen and oxygen
Answer the following question given this paragraph: Bacterial infections of the urinary tract, especially the bladder, are very common. Bladder infections can be treated with antibiotics prescribed by a doctor. If untreated, they may lead to kidney damage. Q: Which organ will bladder infections commonly damage if untreated? Choices: - lungs - heart - tissue - kidney A:
kidney
Q: Answer the following question given this paragraph: The blood vessels are an important part of the cardiovascular system. They connect the heart to every cell in the body. Arteries carry blood away from the heart, while veins return blood to the heart ( Figure below ). Q: In the cardiovascular system, what blood vessels carry blood away from the heart? Choices: - veins - capillaries - cilia - arteries A:
A: arteries
Question: Answer the following question given this paragraph: Ambrosia beetles bore holes in tree bark and "plant" fungal spores in the holes. The holes in the bark give the fungi an ideal place to grow. The beetles harvest fungi from their "garden. ". Q: The ambrosia beetle bores holes in? Choices: - flowers - dirt - leaves - tree bark A:
Answer: tree bark
*Question*
Answer the following question given this paragraph: Moving water also picks up and carries particles of soil and rock. The ability to erode is affected by the velocity, or speed, of the water. The size of the eroded particles depends on the velocity of the water. Eventually, the water deposits the materials. As water slows, larger particles are deposited. As the water slows even more, smaller particles are deposited. The graph in Figure below shows how water velocity and particle size influence erosion and deposition. Q: The ability to what is affected by the velocity, or speed, of the water? Choices: - construct - impede - hinder - erode A:
**Answer**
erode
(Q).
Answer the following question given this paragraph: There are six types of simple machines. Machines that consist of two or more simple machines are called compound machines. Q: How many types of simple machines are there? Choices: - ten types - three types - two types - six types A:
(A).
six types