suppose a scientist wants to create a pool of rna molecules that are 40 nucleotides long and contain every possible combination of bases. what mass of rna nucleotides is needed to synthesize the pool of rna molecules?

i got something better   a catchphrase here it is

ahem  

ahem

what the squwock

explanation:

when you breathe in, or inhale, your diaphragm contracts (tightens) and moves downward. this increases the space in your chest cavity, into which your lungs expand. the intercostal muscles between your ribs also enlarge the chest cavity. they contract to pull your rib cage both upward and outward when you inhale.

since there are no options posted i'll give you a few examples.

a dolphin's flipper, bird's wing, cat's leg.