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Biology, 21.06.2019 20:00
How does pregnancy begin? a) a placenta forms in the uterus b) a sperm reaches an egg in the fallopian tubec) the blastocyst differentiates into two cell types d) contractions begin in the uterine wallapex
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Biology, 21.06.2019 21:30
Out of the seven main animal groups (fish, mammals, birds, insects, reptiles, amphibians, and arachnids), how many contain members with internal backbones? a. 5 b. 3 c. 7 d. 1
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Biology, 22.06.2019 04:00
Explain why the plants cortex would serve as the best food source for animals
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Biology, 22.06.2019 08:00
What advantages does a pedigree have over a written passage?
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Which of the following is evidence for continental drift?
A. There is one continent on Earth. .
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