Can anyone help? the 3 methods are; experiment, sample survey and observational study.

Which of the following are guidelines to follow for obtaining accurate observations

What causes the development of most clouds and precipitation in the atmosphere?

Aball thrown by ginger is moving upward through the air. diagram a shows a box with a downward arrow. diagram b shows a box with an upward arrow. diagram c shows a box with a downward and upward arrow equal in size. diagram d shows a box with a downward and upward arrow with the downward arrow larger in size. which force diagram represents the forces on the ball? you may neglect the effects of air resistance.