When the maturities of a bond issue are spread over several dates, the bonds are called a. serial bonds b. bearer bonds c. debenture bonds d. term bonds?

a. serial bonds

Explanation:

Serial bonds is the term used to represent the issuance of various securities that have their maturity dates set on several different dates, but these dates are set sequentially. That is, the first title wins on day 1, the second title wins on day 2, the third title wins on day 3, and so on until all titles have reached their maturity. Generally these types of bonds are used to provide a steady income stream that will be used to fund projects.

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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.