Annelids-In earthworms, respiration is through the skin, but gills are used to exchange oxygen and and carbon dioxide in other types of annelids. Arthropoda-Some arthropods have gills and some have a tracheal system to obtain oxygen and then get rid of carbon dioxide.nnelids-In earthworms, respiration is through the skin, but gills are used to exchange oxygen and and carbon dioxide in other types of annelids. Arthropoda-Some arthropods have gills and some have a tracheal system to obtain oxygen and then get rid of carbon dioxide.
Cistus, with its many hybrids and cultivars, is commonly encountered as a garden flower. The common name rockrose is applied to the species, a name also shared by the related genera Halimium, Helianthemum and Tuberaria, all in the family Cistaceae. The common name gum cistus is applied to resin-bearing species, especially C. ladanifer.
The red rose was the favorite flower of Venus, the Roman goddess of love. Red roses are considered the flower of love because the color red stands for strong romantic feelings. 189 million stems of roses are sold in the U.S. on Valentine's Day. California produces 60 percent of American roses, but the greater number sold on Valentine's Day in the U.S. are imported, mostly from South America. Approximately 110 million roses, mostly red, will be sold and delivered within the three-day Valentine's Day time period. Greeting Cards Approximately 145 million valentines are sent in the U.S. each year according to estimates by the U.S. Greeting Card Association.