Ismell really really bad any tips and tricks ?

What does all of the organ system in a human form

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

Which of the following was not a major animal on land during the carboniferous period? amphibians insects both a and b none of the above