<span>Antibodies. A. k.a. immunoglobulins. They are produced by a group of white blood cells called B lymphocytes (or B cells). There are 5 classes of immunoglobulins; IgM,IgA,IgE,IgG and IgD.The classes of antibody diifferent both in their constant region and in their activity.IgG, the most common antibody, and is found mostly in the blood and tissue fluids, and IgA is localized in the mucous membranes which line the respiratory and gastrointestinal tracts.</span>
Natural selection is the correct answer
Answer:
By definition, evaporation is a process where water changes into vapour. Condensation is the opposite process where water vapour is converted to tiny droplets of water. Evaporation occurs before a liquid reaches its boiling point. Condensation is a phase change regardless of the temperature.
Answer: Soil forms from weathered rocks and organic material.
The rest of the statements are false. First, fertile soil usually forms in plains or lands with lower steepness of slope. Soil in steep slopes are prone to erosion.
The O-horizon is made of material derived from trees (i.e. leaves, pine needles), decomposed materials and humus.
Lastly, more living organisms in an area means more nutrients for the soil.
