1. A is formed when an object blocks the path of light 2. A mirror works by the light that hits

1.A _shadow_ is formed when an _ transparent _ object blocks the path of light

2. A mirror works by _reflecting_the light that hits

Explanation:

1. A shadow is made when an object blocks light. The object must be opaque or translucent to make a shadow. A transparent object will not make any shadow, as light will pass straight through it.

2.When photons — rays of light — coming from an object (your smiling face, for example) strike the smooth surface of a mirror, they bounce back at the same angle. Your eyes see these reflected photons as a mirror image.

Hope it helps you

advantage of using stem cells in medical research:

1.       it provides medical benefits in the fields of therapeutic cloning and regenerative medicine.

2. it provides great potential for discovering treatments and cures to a variety of diseases including parkinson disease, spinal cord injuries, diabetes, alzheimer’s disease and many more.

3. limbs and organ could be grown in lab from stem cells and then used in transplant or treat illness.

meteorologists would compare a new weather map with one 24 h old to see how fast a front is moving.