Which of the following best describes topsoil? A.
Topsoil is made entirely of minerals weathered from the underlying parent material.
B.
Topsoil is made entirely of decomposed organic remains.
C.
Topsoil is made of humus and mineral particles weathered from the soil's parent material.
D.
Topsoil is made of humus and clay minerals washed down from the layer above the topsoil.

Study the image of this rock.which characteristic best supports its formation from sedimentary processes? it has many layers.it is coarse-grained.its grain shape is round.its texture is non-banded.

If the frequency of the p allele is .63 in the population then what is the frequency of the q allele?

1. variations in a population of moths allow for some of its members to be able to adapt to environmental changes. the better adapted of the moths will be able to survive the change and thus prevail as the “fittest” of the species. (a) describe three mechanisms in which variation can occur within a species population. (b) explain which mechanism or mechanisms would be responsible for the survival of a population of peppered moths better than white moths in an environment affected by industrial soot. justify your answer.