The growth of mosses and lichens on a bare volcanic region helps prepare the area for the next stages of succession. How do mosses and lichens most contribute to this process? Asap

A.
They poison populations of primary consumers.

B.
They build up soil deposits on the rocky ground.

C.
They neutralize deposits of extreme acids in the rocks.

D.
They increase the amount of oxygen in the surrounding air.

Discuss cell surface transport in the structure of constituents

What are the three different shapes, or structures, of carbon-based molecules

Mr. j, age 42, is a construction worker in las vegas. he recently noticed that a mole on his face seemed to be getting larger and darker. at first he did not worry because he was in the sun a lot and assumed the change may have been caused by sunburn. after a month, not only was the mole larger and darker, but it appeared to be “bumpy.” his doctor diagnosed a malignant melanoma skin cancer following biopsy of the nevus. mr. j reports pain in his right shin that does not go away when he puts his feet up or sleeps. discussion questions 1. relate mr. j’s skin changes to the warning signs for malignant melanoma. (see malignant melanoma.) 2. discuss the normal progression of this malignancy. what is the significance of the bone pain that mr. j is experiencing? (see malignant melanoma.) 3. discuss the treatment available for this patient and the prognosis for recovery. (see malignant melanoma.)