Where Does a Plant's Mass Come From?
Have you ever wondered where plants get their mass? All those leaves and branches have to come from somewhere, but where? It turns out that the main ingredients for plant growth are water, air, and energy.
in chemistry a substance that cannot be broken down (separated) by a chemical process... more
What Elements Are Found in the Human Body?
There are 92 elements that occur naturally on Earth. For living things, only 11 of these elements are found in larger than trace quantities. Any amount 0.01% or less is considered a trace element. For vertebrates, such as humans, there are two additional elements that occur in larger than trace amounts these are Iodine and Iron. The periodic table of elements below is color coded to show the elements found in the human body.