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.
Roses are used as cut flowers, screens, borders, containers, hedges, ground cover, wall cover, and of course, as specimen plants in the landscape. There are literally thousands of rose types. Bloom color, bloom shape, foliage, size, fragrance and plant shape are all things to look at when shopping for roses.This guide will help you sort through all the varieties of roses. Thorns are common and usually considered a necessary evil by rose aficionados, but there are some thornless varieties available. 2  Look at the color of flowers and foliage when selecting roses. 3  Find the type that would look best in your landscape. 4  The mature size of the rose is a key consideration when planting.