There are 25 elements found in living things. how many of these elements are found in some organisms but not all?

1
6
19
25

How can you keep track of variables in a science experiment?

Biology 1c cumulative exam i need awsners

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