Which two factors are responsible for seasons on earth

What was carolus linnaeus' classification system of organisms based on? a.physical characteristics of organisms b.food habits of organisms c.habitat of organisms d.size of organisms

After fertilization, which type of cellular division is responsible for the growth and development of a complex, multicellular organism?

Which of the following is a limitation of a clinical trial? a.)amount of random assignments b.)hospital cost c.)number of test tubes d.)amount of peer review