Umami is found in foods such as seaweed, miso, mushrooms, and parmesean cheese... It generally tastes “savory,” but I wouldn’t say that it tastes “meaty.” A or B is likely your best bet.
One example of a positive feedback loop in childbirth is contractions. When the contractions start, they produce oxytocin, which stimulates stronger contractions, which produce more oxytocin.
Answer:
A) Neither; they both have the same frequency.