Sound is created by our vocal cord due to (a) Air in lungs
(b) Vibration in lungs
(c) Vibration in throat
(d) none of these

What are the types of genetic recombination

Give the biological term for: structures that display characteristics of living organisms only within living cells

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