There are many people opposed to stem cell research based on ethical grounds. this is because the stem cell used are often taken from human embroys

What causes eclipses? check all that apply. earth's rotation on its axis moon's shadow covering the sun earth's shadow covering the moon earth's orbit and moon's orbit occasionally aligning the moon and sun's gravity pulling in the same direction

Organisms may contain up to five levels of organization within their bodies. which level of organization is shown by the liver? a. tissue b. organ c. organism d. organ system

In this picture, groups of pigment that capture light energy are located on the