In 1962, walter stoeckenius described the structure of the plasma membrane using electron microscopy. he described some micrographs as having the appearance of three layers, with two dense outer layers and a lighter middle layer. however, it is well‑established that the plasma membrane is a bilayer. in his paper, stoeckenius also stated that previous papers had established the bilayer structure of the membrane. sapling

answer; andrew jackson approved nullification by signing it into law,and john calhoun opposed it saying it was unconstitutional;

monitor contract compliance and results of forestry activities to assure adherence to government regulations.  

plan and supervise forestry projects, such as determining the type, number and placement of trees to be planted, managing tree nurseries, thinning forest and monitoring growth of new seedlings.  

establish short- and long-term plans for management of forest lands and forest resources.  

determine methods of cutting and removing timber with minimum waste and environmental damage.  

supervise activities of other forestry workers.

by the way there is no video here.

which statement explains one of the reasons world war 1 was so much more destructive than earlier conflicts

the answer is heceta and bodega y quadra. i hope i you with this question!