Why are functional mris useful for doctors

Check all that apply diatoms are marine algae that have a shell made of silica, what are some of the uses of the silica shell after the diatoms die? 1.the shells make up the diatomaceous earth used in filters 2.it can be used as an ingredient in abrasives 3.they are used in food products 4.the shells can be used in some insulating materials

Awave has a wavelength of 15 mm and a frequency of 6 hertz. what is its speed?

Types of scientific inquiry that biologist engage in that cannot be completely controlled