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Chlorophyll
Chlorophyll is a green photosynthetic pigment found in plants, algae, and cyanobacteria. Chlorophyll absorbs mostly in the blue and to a lesser extent red portions of the electromagnetic spectrum, ... > more -
Algal bloom
An algal bloom or marine bloom or water bloom is a rapid increase in the population of algae in an aquatic system. Algal blooms may occur in freshwater as well as marine environments. Typically only ... > more -
Heirloom plant
An heirloom plant is an open-pollinated cultivar that was commonly grown during earlier periods in human history, but which is not used in modern large-scale agriculture. Since most popular heirloom ... > more -
Hummingbird
Hummingbirds are small birds in the family Trochilidae. They are distinguished by their ability to hover in mid-air by rapidly flapping their wings, 15 to 80 times per second. They are named for the ... > more
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