The roles of scientists and engineers in the advancement of science and technology complement each other. in general, scientists conduct in-
depth scientific study and research, which provides the foundation for technology, while engineers use this knowledge to carry out the practical
application of science and technology to solve problems. when scientists and engineers test new ideas, they follow similar procedures. match
these steps, which are only a small part of the testing process, to either scientific inquiry or engineering design.

the answer is yes, they are born/created, then they grow to their limit then produce offspring, then die.

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.

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explanation:

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