The typical light microscope at its maximum magnification power has a resolution of 200 nm. The light microscope is able to view and distinguish between two lines or points that are no less than 200 nm apart. Since our membrane of interest is 8 nm apart, it won't be visible under the light microscope. Several such membranes are needed to lined side by side to make the viewing possible. The number of membranes should be, 
= 25.
An unbalanced Chemical Equation only tells us which componds react With eachother and what the Product is.
A balansed Equation also tells us how many molecules of each reactant, and how many molecules of Product in a reaction.
The answer is polygenic traits.
Polygenic traits are determined by an interaction of multiple genes. As the name suggests, poly (Greek) means many, thus, polygenic means many genes. Many genes interact and together influence some phenotypic trait. Quantitative phenotypes are usually attributed to the polygenic effects.
C) the corpus luteum produces progesterone (pro-gestation) until the placenta takes over at around 10 weeks
