Help me please I don’t know what to do

All individuals have two alleles for a given trait. according to mendel's these alleles are passed down one each from both mother and father.

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

Each hereditary trait corresponds to