In what situation do covalent bods occur? a. electrons are shared by many atoms and move freely b. electrons are shared equally or c. a stronger atom pulls electrons away from the weaker atom

The fact that the total amount of energy in a system remains constant is a(n)

When did stem cell research become known ? who discovered stem cell? what experiments or studies have been conducted so far?

Alice did an experiment to find the relationship between the angle at which a ray of light strikes a mirror and the angle at which the mirror reflects the light. she placed a ray box in front of a mirror. she changed the angle at which the light from the ray box struck the mirror and noted the corresponding angle at which the mirror reflected the light. which of the following is the dependent variable in this experiment? the mirror used to reflect the light the ray box used as the source of light angle at which the light from the ray box strikes the mirror angle at which the mirror reflects the light from the ray box