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1. Start of menstruation is a sign that a girl is A. already pregnant C. already a woman B. capable of being pregnant D. can carry heavy things 2. Why is menstruation considered a cycle? A. It happens every month. C. The woman gets pregnant every year. B. The woman gets pregnant every month. D. It is normal to all women. 3. When does menstrual flow takes place? A. When ovulation happens C. When the egg cell stays in the fallopian tube B. When the egg cell is fertilized D. When the egg is not fertilized 4. Which organism does not produce an external egg as part of its life cycle? A. dog B. parrot C. turtle D. insect 5. Which of these animals reproduce by external fertilization? A. camel B. human C. parrot D. bats 6. What is reproduction? A. When parents make offspring. B. When offspring make adults. C. When offspring is an exact copy of the adult. D. When offspring is an exact opposite of the adult​