Answer:
Photons and waves
Explanation:
Light can be thought of as a wave and as particles. Photons are the specific type of particles of which light is composed.
Observing how the person solves problems.
Answer:
C.
Explanation:
It should be understood that a mixed design or mixed factorial design involves two or more independent variables, of which at least one is a within-subjects (repeated measures) factor and at least one is a between-groups factor. In the simplest case, there will be one between-groups factor and one within-subjects factor.
Answer:
Period a is known as prehistory.
Explanation:
Scholars define prehistory as events that occurred before the existence of written records in a given culture or society. History refers to the time period after the invention of written records in a given culture or society.
Where is answer for B?
