Briefly describe how the human voice is produced

Compare and contrast the adaptations of free-living flatworms and parasitic flatworms

What do animals wth echolocation have in common other than echolocation

Which set of characteristics best describes sedimentary rock? a) largest type of rock, made of organic matter, hardest type of rock b) often contains layers, forms near sources of water, contains fossils c) least abundant type of rock, made of other rocks, made mostly of minerals d) most abundant type in earth's crust, made of magma/lava, contains no fossils