The american biologists who tested watson and crick's hypothesis for dna replication were

Meselson & Stahl

The two American biologist were Matthew Stanley Meselson and Franklin W. Stahl who are notable for their experimental confirmation of the Watson-Crick theory of the structure and method of replication of deoxyribonucleic acid. They distinguished old DNA and synthesized DNA, which proved that DNA replicates by a semi-conservative mechanism.

the real answer is b. scintillation counter

starchy vegetables are high in carbohydrates.

starchy vegetables contain more carbohydrates than non-starchy vegetables.

explanation:

there are two primary categories of carbohydrates, essentially differentiated on the basis of their carbohydrate content (which is in the form of starch - a complex carbohydrate):

those vegetables which contain little amounts of starch are termed as non-starchy vegetables, and some examples include: artichokes, broccoli and bean sprouts.

vegetables high in their starch content are distinguished as starchy vegetables, and some examples include: potatoes, chickpeas and corn.