When the temperature of its environment changes, the temperature of a snake

How do you date a sample of rock that you suspect as being one of the earliest on earth

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

Hemoglobin is a proton that carries oxygen around the body what is hemoglobin made from