When foreign substances enter the body, the immune system provides specific antibodies that bind to them, forming complexes.
These complexes are then engulfed by phagocytic cells.
These
foreign
substances
antibodies bind to
foreign substances
complexes are
engulfed by
phagocytic cells
These phagocytic cells are most likely to be
A.
stem cells.
B. bone cells.
C. red blood cells.
D. white blood cells.
Reset
Submit

White Blood Cells

Explanation:

White blood cells are primarily responsible for protecting the body from infection. There are many different types of white blood cells. Some white blood cells are phagocytic and engulf invaders. Others produce antibodies that attack foreign substances or mark them for killing.

estuaries are the partially enclosed coastal bodies of brackish water formed at the mouth of sea where river meets an ocean. it is a transition zone between river and sea water so estuaries are influenced to both marine environment such as tides, waves and to riverine such as flow of fresh water and sediments. the mixing of sea and fresh water provide high level of nutrients, making estuaries a high product habitats.

many estuaries suffers degradation from a variety of human activities like erosion from deforestation, overgrazing, overfishing, drainage and eutrophication.

so from the above statement answers will be

1. false as estuaries are formed due to both brackish and freshwater.

2.true, due to high productivity estuaries are breeding ground for many marine species.

3. direct and indirect activities of man that contribute to pollution and deposition of sediments.