Mendel′s laws are only valid under the presumption that:

a. the case in point is monogenic heredity
b. the genes observed are in linkage
c. the genes for the traits observed are localised on one chromosome
d. if the genes observed are linked to chromosome X

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