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 main difference between the two rose types is in flowering habit. Both bear large flowers, usually with 30 to 50 petals. Hybrid tea roses, like Peace (Rosa Peace), hardy in U.S. Department of Agriculture plant hardiness zones 5 through 9, usually feature single blooms atop tall stems. Grandiflora roses, like Queen Elizabeth (Rosa Queen Elizabeth), also hardy in USDA zones 5 through 9, bear flowers in clusters.