Q: What is the matter through which sound waves travel? Read this paragraph and choose the correct option from the provided answers: Sound waves are mechanical waves, and mechanical waves can only travel through matter. The matter through which the waves travel is called the medium (plural, media). The Table below gives the speed of sound in several different media. Generally, sound waves travel most quickly through solids, followed by liquids, and then by gases. Particles of matter are closest together in solids and farthest apart in gases. When particles are closer together, they can more quickly pass the energy of vibrations to nearby particles. You can explore the speed of sound in different media at this URL:. Choices: - dust - mass - air - medium A:
medium

Q: What is the term for animal-like protists that are usually single-celled? Read this paragraph and choose the correct option from the provided answers: Animal-like protists are called protozoa. Most consist a single cell. Choices: - eukaryotes - vertebrates - larvae - protozoa A:
protozoa

Q: The kidneys help control acid-base balance by excreting _____ and generating bicarbonate that helps maintain blood plasma ph within a normal range? Read this paragraph and choose the correct option from the provided answers: Buffer Systems in the Body The buffer systems in the human body are extremely efficient, and different systems work at different rates. It takes only seconds for the chemical buffers in the blood to make adjustments to pH. The respiratory tract can adjust the blood pH upward in minutes by exhaling CO2 from the body. The renal system can also adjust blood pH through the excretion of hydrogen ions (H+) and the conservation of bicarbonate, but this process takes hours to days to have an effect. The buffer systems functioning in blood plasma include plasma proteins, phosphate, and bicarbonate and carbonic acid buffers. The kidneys help control acid-base balance by excreting hydrogen ions and generating bicarbonate that helps maintain blood plasma pH within a normal range. Protein buffer systems work predominantly inside cells. Choices: - magnesium ions - sodium ions - lithium ions - hydrogen ions A:
hydrogen ions

Q: The most common curved mirrors are what? Read this paragraph and choose the correct option from the provided answers: Reflecting surfaces do not have to be flat. The most common curved mirrors are spherical. A spherical mirror is called a concave mirror if the center of the mirror is further from the viewer than the edges are. A spherical mirror is called a convex mirror if the center of the mirror is closer to the viewer than the edges are. Choices: - solid - concave - convex - spherical A:
spherical