Which mountain range was formed at a divergent boundary?
a-the mid-atlantic ridge
b-the andes mountains in south america
c-the ural mountains in russia
d-the aleutian islands in alaska

its 42

i say its d?

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.

b. the carbon cycle ensures living things have a source of hydrogen