Hich of the following is a result of natural erosion? a. desert sands b. lost seed germination c. widened valleys d. all of the above

The correct answer is All of the above.

Natural erosion is technique which takes millions of years to level the mountain ranges. New soil can be formed by slow weathering of rocks. Natural erosion include wind and water as an important factor for the erosion of soil.

1. Desert sands are carried away by the wind and leads to erosion of upper layer of sandy soil.

2. The river present between valley caries away the soil and sediments which contributes to valley widening.  

3. The germinated seeds are carried away by the wind or by water as a result of soil erosion. This causes the loss of germinated seeds.

white blood cells or wbc s are mainly 2 types-

1.agranulocytes

2.granulocytes

the monocytes or macrophages of agranulocytes , dendritic cells which are accessory leucocytes, and b cells which is one type of lymphocytes   identify the antigens present on the pathogen's surface. these three cells are called antigen presenting cells(apc) which are phagocytes and destroy the antigens by secreting antitoxins. besides this leukocyte is always plays vital role in the immunity of the body.

cell regulation is conducted by special proteins.