I think the answer is <span>C. mixture of ionic and molecular substances</span>
Usually occurs in fallopian tube.
Answer: The correct answer is- C) macrophages.
Macrophages are a type of phagocytic cell of immune system as they engulf/eat foreign pathogen (such as bacteria) through a process called phagocytosis.
These cells play significant role in initiating the immune response in the body.
They first detect the invading pathogen (foreign substances), after which they engulf and destroy them.
They are produced by differentiation of monocyte when monocyte leave bloodstream and enter specific tissue sites such as spleen, lungs, lymph nodes.
Answer:
Explanation:
he heart is composed of cardiac muscle, specialized conductive tissue, valves, blood vessels and connective tissue. Cardiac muscle, the myocardium, consists of cross-striated muscle cells, cardiomyocytes, with one centrally placed nucleus.
Answer:
(D) cause iron in ocean water and terrestrial rocks to rust (oxidize).
Explanation:
The primitive atmosphere on the earth was reducing since free molecular oxygen was not present in it. Evolution of autotrophic organisms that split water during photosynthesis and release oxygen as a by-product changed the atmosphere into an oxidizing one. Plants and bacteria were some of these autotrophs. The addition of oxygen to the atmosphere led to oxidation of metal ions such as iron present in the water of oceans and rocks. Oxidation of iron led to the formation of iron oxide that formed rust layer on it.