Reef systems

a. are seriously threatened ecosystems.
b. are formed from calcium carbonate secreted
by coral polyps.
c. have symbiotic dinoflagellates in the living
coral.
d. have shown widespread bleaching; death of
corals is being reported worldwide.
e. include all of these


E

Biology & Microbiology

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The surface of each B lymphocyte is covered with about 250,000 to 500,000 identical copies of (BCR/MHC/TCR).

Fill in the blank(s) with the appropriate word(s).

Biology & Microbiology