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 acrobats of the rose world, climbing varieties develop long canes well adapted to training on pillars, fences, arbors, and gazebos. Most climbing roses are mutations or variations of bush-type varieties. They develop either large, single flowers or clustered blooms on a stem. Climbers may bloom once a season or continually, depending on the variety. Climbers can be trained to bloom more heavily by leading their canes in a horizontal direction.