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The correct answer is (c) discover antigens in body fluids.
B lymphocytes act as antigen presenting cells that recognizes and displays the antigen to the white blood cells. These cells process the antigens that are present in body fluids. Professional antigen presenting cells includes B-lymphocytes, macrophages, dendritic cells, etc. 
 
        
             
        
        
        
ANSWER:
Synonyms for light:
flash, glimmer, glint, glitter, scintillation, shimmer, sparkle, twinkle
daylight, moonlight, sunlight, sunshine
afterglow, aureole (or aureola), aurora, beam, halo, ray, shaft, streak, stream, sunbeam
glisten, gloss, luster (or lustre), polish, reflection, sheen
Antonyms for light:
blackness, dark, darkness, dimness, dusk, duskiness, gloom, night, shadow
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Answer:
B. As snow and ice melt, the underlying surfaces absorb heat from solar radiation
Explanation:
Which of these is part of a feedback loop that results in a cooling effect on Earth as snow and ice melt, the underlying surfaces absorb heat from solar 
 
        
                    
             
        
        
        
Answer: The tracheids have important functions in the plant.
Explanation: The mechanical support is provided by the lignified walls of tracheid cell. the helps in other functions of the plant such as transporting water and getting the solute from the root to the stem and eventually the leaf of the plant.
The tracheids are most useful in the gymnosperms where elements need to be transported.
Identifying a tracheid in a cross section is quire easy as the tracheid cells fit into each other neatly and piled up similarly and have identical shapes as well which makes them obvious from other cells.              
The two examples of tracheid plans could be 
The most common thing that could be found in traceid plant is that this cells are mainly present for transporting either water other solutes in the plant body.