Identify the two main gases that are exchanged between the respiratory
and circulatory systems.

What is the broadest level of classification of life

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

Amap's orientation is typically determined by an