What do aquatic groups ranging from foraminifera, to corals, to bivalve mollusks require in order to build their hard parts?

A. Oxalic acid
B. Potassium carbonate
C. Protein
D. Calcium carbonate
E. Iron oxide


Answer: D

Biology & Microbiology

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Maggie was told she has a positive titer to measles. Which of the following could explain this?

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About 1 in every 1,000 women has three X chromosomes, a condition known as ________ X

Fill in the blank(s) with correct word

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