Three molecules of calcium metal and one molecule of nitrogen gas react to form one molecule of solid calcium nitride. Write the equation

Draw the structure of dna nucleotide with adenine as nitrogenous base

Which of the following statements about archaea and bacteria is true? a. neither is single-celled. b. they both have nuclear membranes. c. neither reproduces by binary fission. d. they both lack a nuclear membrane.

Aristotle classified animals according to their a. habitat and mating behavior c. mating behavior and relatedness b. habitat and physical differences d. physical differences and mating behavior