What is the purpose of the plasma membrane? makes food for the cell

reproduces cells

encloses specific structures

keeps the cell small

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

Which of these is not a nucleotide base found in dna?

What is the difference between a scientific hypotheses and a scientific theory?