Atoy plane weighs 500g. when placed in water, it changes the water level from 250ml to 300ml. what is the density?

What term is missing from the central region that describes hypotheses, theories, and laws? popular predictable mathematical falsifiable

Although respiratory organs vary across different organisms, they all contain respiratory surfaces that have a large surface area and are extremely thin. explain why having an extremely thin respiratory surface with a large surface area is advantageous for the process of gas exchange

Avariable that is not being directly tested during an experiment should be changed varied experimented controlled