6. Which marrow was denser (had more mass in the given volume)? What impact would that have on the overall density of the bone?

Why is excretion necessary to maintain homeostasis?

Body systems are not completely independent they integrate and work together describe one example of the integration between body systems

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.