help!! Air molecules get farther apart when heated and some escape from the can, which causing the air pressure inside the can to

There are six elements that make up most of the human body. which of the following is not one of these six elements?

Look at the images of different rocks. which rocks have a fine-grained texture? check all that apply. 1 2 3 4 5

Researchers randomly divide participants into groups. each group takes a different amount of omega-3 fatty acid supplements daily for a month. one group receives a placebo. the researchers measure the impact on cholesterol levels in the blood. what is the purpose of random assignment in this experiment? a, to produce treatment groups with similar characteristics b, to ensure that all people with high cholesterol have an equal chance of being selected for the study c, to increase the accuracy of the research results and prevent skewness in the data