Embryonic stem cells can become all cell types of the body because they are pluripotent. Adult stem cells are thought to be limited to differentiating into different cell types of their tissue of origin. Embryonic stem cells can be grown relatively easily in culture.
I think it's B because waxing crescent and first quarter is a small part of the full moon
Light that appears white or nearly white to humans is made up of spectrum of visible light i.e. combination of violet, indigo, blue, green, yellow, orange and red.
The all original volcano, or my personal favorite, how to save an egg from a long drop using balloons or parachute etc