In this task, find the most appropriate number to replace the blank (indicated with _ ) and express it in words.

Q: Lactation probably occurs for the first _ months after parturation.

A: two
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Q: Echocardiography demonstrates in clear, graphic fashion the _ cardiac chambers and four valves.

A: four
****
Q: Yeast exist in _ mating types, a and .

A:
two
****