Helppp I have no clue which one :)

Light waves can move through , but they travel fastest when they move through a(n) .

What type of radiation is lead emitting in the following equation? alpha particles beta particles gamma rays

In what way do investigations build scientific knowledge? the results of investigations lead to questions that cannot be tested. they reflect the opinions and social values of scientists, ensuring valid information. the results of investigations lead to new questions, which lead to new investigations. they are not influenced by the research of earlier scientists, so they are able to address gaps in understanding. i