Is the ability to roll your tounge genetic?

What is the most appropriate method of gaining weight (muscle mass)

Drag each description to the correct location on the image. not all descriptions will be used. describe the parts of a comet. the frozen part of the comet the atmosphere of gases and dust formed when the nucleus vaporizes tail made of small, solid dust particles tail made of ions that appears to point away from the comet's orbit

What is the difference between a scientific hypotheses and a scientific theory?