Given a sentence with a missing word, pick the answer option that best fills out the missing word in the sentence. Indicate each answer with its index ('a', 'b', 'c', 'd').
--------
Question: Earthworms have ____ pairs of hearts.\Question: Choose the right answer from options given a) seven b) five c) one d) no

Answer: b


Question: Alleles segregate independently yielding ____ possible allelic combinations in gametes.\Question: Choose the right answer from options given a) ten b) one c) four d) nine

Answer: c


Question: Female sturgeon spawn only every ____ to seven years.\Question: Choose the right answer from options given a) seven b) ten c) two d) four

Answer:
d