What are the 3 major functional units of a gene and what are their functions ?

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

Archaebacteria use for movement. celia flagella pili cell walls

Which of the following is the earliest era of earth's geologic time scale? cenozoic mesozoic precambrian paleozoic