In clinical trials of medicines why is one group of volunteers given a placebo

Of all the ways that Renaissance society was hierarchically divided, what was regarded as the most "natural" distinction and therefore the most important one to defend?

Which relationship is different? monosaccharide / polysaccharide phospholipid / lipids amino acid / protein nucleotide / nucleic acid?

The codon chart shown here uses the three base sequence found on the mrna molecule after the information is copied from dna during transcription. if the mrna message is aac uac ugc, what was the original dna base a. aac tac tgc b. uug aug acg c.

Why should an experiment be replicable?

1. All of the following would result in a change in population size except A. emigration of individuals out of the population range. B. equal birth and death rates. C. immigration of individuals into the population range. D.

A solution in which the concentration of dissolved substances is lower than the concentration inside a cell is hypertonic.

What is the difference between discharge zone and recharged zone

What can happen in the hydrologic cycle to move pollutants into the water?

What are microplastics

Explain why the chromosomes in the haploid cells that are produced by meiosis I look different than those produced by meiosis II.