Which system runs perpendicular to the myofibril and functions with the triad as a microtransportation network to spread the action potential from the fiber's outer membrane inward to deeper regions of the cell?

Describe the iron sulfide hypothesis and the lipid membrane hypothesis.

Autotrophs a.consume their food to get energy b.may use photosynthesis to gain energy c.are also called consumers d.cannot use solar energy

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.