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A Lesson 2
4th grade Science
Question | Answer |
---|---|
fossil | any evidence of an organism that lived in the past |
fertilization | joining together the female sex cell[the egg]with a male sex cell[the sperm],to produce a fertilized egg |
mass extinctions | when many different species die out at about the same time |
extinct | said of an organism no longer alive on earth |
embryo | a developing organism that results from fertilization |