Primary producers, also called autotrophs, are organisms that can produce their own food. Most autotrophs lie at the bottom of the food chain, serving as food sources for animals farther up the line. Primary producers are self-sufficient when it comes to meals: they pro...
A primary source is a document used in research that provides first-hand, direct evidence of a particular time period or event. These sources are either recorded directly at the time the event took place, or chronicled at a later date.
Generally, primary sources are considered as documents or footage that was created during the time of an event. If no primary sources are available, other sources can be considered primary for this purpose.
The colors that never result from combining two other colors are the primary colors of pigment, while the colors that produce white light when combined are the primary colors of light. Each of these categories includes three primary colors.
Red, yellow and blue are the three primary colors. Primary colors are colors that make up every other color on the color wheel, and no other colors can be combined to create red, yellow or blue.
The four primary colors in the 4-primary color wheel are blue, yellow, green and red. This differs from the color mixing wheel, which only has three primary colors.
Candidates in a primary election are seeking to secure the nomination of a certain political party so as to allow that candidate to run in the general election ballot. After candidates file to run in the primary election, voters select a single candidate for each office...