The master gland of the endocrine system is the

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 organ controls breathing? lungs alveoli heart diaphragm

What are 3 reasons that natural selection occurs