During the Carboniferous period, Virginia was equatorial and the warm seas supported abundant life and the deposition of lime sediments. The limestones produced from these sediments contain fossils of bryozoans and relatives of sea urchins and sand dollars. On land, coastal swamps formed along what is now the Appalachian Plateau. Tree ferns, horsetail rushes, and other plants grew in abundance in these swampy lowlands. This warm, tropical environment was the original source of what natural resource mined throughout this area during the past century? A) coal B) gypsum C) kaolin D) methane

What is one disadvantage of desalination? a - the process kills fish. b - the process uses fuel that is expensive. c - the process makes water that is unsafe to drink. d - the process is too difficult to carry out in big cities. quick taking a !

Plants are used for so many things. in your house alone, you can probably look around you and see where plants have been used. for this project, you will identify various uses of plants in your home. directions make a list of objects, products, and any other items around your house where plants were involved in the production of the item. you should have a list of at least twenty items. then respond to the following questions: note: your list of objects and the answers following should be at least 200 words in length. what if plants no longer existed on earth? how would your life be different?

Which of these is not a function of some membrane proteins ? a. allowing polar molecules to enter the cell b. recognizing other types of cells c. receiving messeges from other cells b. carrying messages to oher cells