What gives the gem amethyst is purplish color?

a. Quartz

b. Iron

c. Oxygen

d. Titanium

What is technology? A. A method for doing scientific research B. A system of government C. The use of science to answer ethical questions D. Science applied to practical problems

Elements 1 and 3 are used to make the most common substance in the body. What are these elements? A. Nitrogren & Phosphorus B. Oxygen & Hydrogen C. Hydrogen & Helium D. Oxygen & Sulfur

How many tissues should the kimberly clark corporation package of tissue contain?

Which structures are responsible for producing semen

Why are the arrows always drawn from the prey toward the predator and never toward prey

Which human activity increases beach erosion? A) large storm waves B) removing beach plants C) over-protecting sand dunes D) swimming near the shoreline

For plants and other organisms to develop differences among their respective species the alleles of their genes must contain variations. What is the original source of these variations?

Describe how deforestation might contribute to global warming.

In Biology, name the term when a whitish liquid excrete out from a man's private part.

We can test the relative permeability of a phospholipid bilayer by using a synthetic membrane that does not contain any protein components. Some uncharged, polar molecules are found to diffuse freely across these membranes to varying degrees.