Why are compounds different from single elements? a when elements form a compound, the bonds and structure of the elements change. b when elements form a compound, the masses of the elements increase. c when elements form a compound, the masses of the elements decrease. d when the elements form a compound nothing is different.

a tetrad is the foursome during meiosis made by two homologous chromosomes that have each already replicated into a pair of sister chromatids.

the principles and empirical processes of discovery and demonstration considered characteristic of or necessary for scientific investigation, generally involving the observation of phenomena, the formulation of a hypothesis concerning the phenomena, experimentation to test the hypothesis, and development of a conclusion that confirms, rejects, or modifies the hypothesis.