15 ! scientist tested the effect of a fertilizer on the growth of plants. they had two sets of plants group a which gets fertilizer water & and group b which gets only water and sun (but equal amounts to group a) 1. explain how this scenario is a controlled experiment and identify the manipulated variable? 2. if the scientist only performed one experiment but it supported their hypothesis why can it not be considered a theory?

Iwill give brainliest if you answer right : )

Blank liquids and gases exert a buoyant force on objects placed in them

Sawyer is studying diffraction. he draws a diagram of a plane wave to show how light waves travel. which best describes sawyer’s error? the wave fronts should be perpendicular to the direction in which the waves move. the arrow showing the direction of movement of the waves should be pointing to the left. the arrow showing the direction of movement of the waves should be pointing downward. the wave fronts should be both parallel and perpendicular to the direction in which the waves move.