1. The sound waves then travel toward a flexible, oval membrane at the end of the ear canal called the eardrum, or tympanic membrane.
2. The sound waves move through each of these mediums by vibrating the molecules in the matter.
Cartilage. pls mark brainiest answer please
Answer:
The first one is correct. :)
First trimester: 1 - 12 weeks
Second trimester: 13 - 26 weeks
Third trimester: 27 - 40 weeks, or end of pregnancy
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