Akind of white blood cell that ingests or engulfs pathogens are called

Answer;
Nuetrophil
Neutrophil is the kind of white blood cell that ingests or engulfs and destroys pathogens. 

Explanation;
The process of engulfing a pathogen and destroying is is called phagocytosis and the cell that destroy pathogens by engulfing it or ingesting it is called a phagocyte or phagocytic cell.
In the blood, there two types of white blood cells, that is, neutrophilic leucocytes and monocytes that are phagocytic. Neutrophils are smaller, granular leukocytes that quickly appear at the site of a wound and ingest bacteria. 

Reduction in overall biodiversity