Which of earth’s layers is just below the lower mantle

What do nitrifying bacteria convert

Which scientific design has both practical limitations and limitations due to scale? studying the effect of bleach on the growth of mold spores exposing cultures of duckweed to different intensities of light observing the replication of dna molecules with a hand lens using colored marbles to model a cross between two colors of rabbits

This is a situation in which genes are attached to an organism's sex chromosomes; the sex of an organism influences the expression of a gene.