Why does boiled yeast not ferment?

The energy needs of a human population are not affected by

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

Describe the function of the endomembrane system? what organelles are involved?