A child demonstrates increasing language skills and an understanding of symbols. Creative play and the use of imagination is an important activity in the child's life. Based upon these characteristics and according to Jean Piaget's theory, what stage of cognitive development is the child demonstrating?
A) Preoperational stage
B) Sensorimotor stage
C) Concrete operational stage
D) Formal operational stage

What body systems are involded in sleep homeostasis

Last 5 benefits of physical activity and identify each benefit as either a physical mental and emotional or social benefit

You isolate an infectious substance capable of causing disease in plants, but you do not know whether the infectious agent is a bacterium, virus, viroid, or prion. you have four methods at your disposal to analyze the substance and determine the nature of the infectious agent.i. treat the substance with enzymes that destroy all nucleic acids and then determine whether the substance is still infectious.ii. microscope.iii. culture the substance on nutritive medium, away from any plant cells.iv. treat the sample with proteases that digest all proteins and then determining whether the substance is still infectious.if you already know that the infectious agent was either bacterial or viral, which method(s) listed above would allow you to distinguish between these two possibilities? a) ib) iic) ii or iiid) iv