All galaxies are held together by gravity, but based on what we can see (stars, nebulae, etc.) , there shouldn’t be enough gravity to do the job. That is why scientists believe that all galaxies are partially held together by a substance called , which we can’t see.

Nonverbal communication may best be defined as

Usha is giving a presentation on the cardiovascular system. one of her slides shows a diagram of the blood moving from the heart to the arms and legs. which type of circulation is the slide illustrating? systemic circulation pulmonary circulation systolic circulation diastolic circulation

The flashing of directional signals as it indicates that used it safe to bed