Which of these statements is correct? a. particles in a suspension will settle out if left undisturbed. b. a solution is heterogeneous. c. a colloidal system does not exhibit the tyndall effect. d. the particles in a colloidal system are all the same size.

answer: 21

step-by-step explanation:

divide 630 by 30. 30 goes into 630 21 times

b.have there own function.

about 40,000,000 results (0.81 seconds)  

search results

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.