HELP ASAR Why are individuals in many developing countries susceptible to diseases such as polio and pertussis? A. because of poor hygiene
B. because of genetic variation
C. because of a lack of vaccination
D. because of a lack of education

How does buring fossil fuels impact does carbon cycle? what large impact does this have on the envirnment?

The current thought on the structure of the cell membrane is: a. a static phosphate sandwich of lipids b. a fluid-mosaic of phospholipids and proteins c. a bilayer of proteins with static lipid molecules d. an impermeable bilayer of protein molecules e. a static and permeable phospholipid single layer

Why are lipids and proteins free to move laterally in membranes?