When an antigen is present, are the first type of white blood cell to come to the body’s defense?

Phagocytes.

Explanation:

Macrophages are the most relevant phagocytic cells. These cells are the differentiated form of blood monocytes, which are strategically distributed in various tissues to origin the mononuclear phagocyte system.

Macrophage functions are characterized by neutralization, ingestion and destruction of particles, including biopathogens, in addition to processing and presenting antigens for T lymphocytes.

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which rock will weather faster?

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the menstrual cycle – higher tier. negative feedback mechanisms affect the production of hormones in the menstrual cycle. oestrogen also stimulates the release of lh (luteinising hormone) from the pituitary gland, which in turn controls the production of progesterone.