Develop a model to describe the cycling of matter and flow of energy among living and nonliving parts of an ecosystem.

answer; a male inherits only one allele of the x-linked gene controlling hair color;

answer: d. load

a river's load refers to the natural phenomena in which the sediments, rocks   stones, boulders and other deposits are removed and picked from the bottom bed of the river due to the abrasion resulted by the high speed water current.