1. How did you model mutations in this project?

Which statement correctly describes metallic bonds? a. they form when certain atoms lose electrons and other atoms gain electrons. b. they involve an attraction between anions and cations. they always involvpoth a metal and a nonmetal. d. they can only form between atoms of the same element. e. they form because electrons can move freely between atoms.

Particles vibrate in a rigid structure and do not move relative to their neighbors.

Which of the following describes a situation where competition between producers exists