Which of the following describes a potential problem with case studies? 1. They generally involve too few participants to allow meaningful conclusions. 2. They generally involve too many participants to allow meaningful conclusions. 3. They are generally conducted by people who are untrained in scientific observation. 4. They are generally biased due to the patient’s awareness of their illness.

characterization of nanoparticles is a critical step in nanomaterial production as it provides information of dimension, morphology, surface charge, distribution and degree of surface functionalization.

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what do the different brain waves do?

explanation:

brainwaves are produced by synchronised electrical pulses from masses of neurons communicating with each other. brainwaves are detected using sensors placed on the scalp. brainwave speed is measured in hertz (cycles per second) and they are divided into bands delineating slow, moderate, and fast waves.