How do scientist develop scientific explanations about subjects that are impossible to study through controlled experiments?

What is true about the relationship of adenine and thymine? - Adenine and thymine are a base pair - Adenine and thymine are antiparallel - Adenine and thymine form a covalent bond - Adenine and thymine are phosphates

How much of our total body weight is water? 30-50 percent 40-60 percent 50-70 percent 60-80 percent?

Which scientist proposed the idea of studying humans as groups rather than as individuals? A. Lamarck B. Darwin C. Malthus D. Linnaeus

A diploid cell with 2n = 20 chromosomes goes through meiosis. how many chromosomes will each of the daughter cells have?

Number of chromosomes in new cells meiosis

Usually, a mutation in the promoter region of an operon causes reduced levels of synthesis of the proteins encoded by that operon. Occasionally, a mutation in the promoter region actually causes increased levels of synthesis.

Genes do not exert the only influence on personality. therefore,:

Bats contain brown fat between their shoulder blades. how could this brown fat be an adaptation to torpor?

How many kingdoms are in the modern system of classification?

One cell that undergoes meiosis will yield how many independent cells