2. Importance of root and tuber crops in Africa. In Africa, roots and tubers are generally grown in countries located in the Sub-Saharan zones, notably in Nigeria, Ghana, Cote cÃ´te'D, Ivoire, Nigeria, Benin, Cameroon Central African, Republic.D.R, C, Tanzania, Mozambique, Angola, Uganda, Malawi madagascar And. rwanda
The healthy human ear can hear frequencies ranging from 20Hz to 20,000 Hz. Over time, the hair cellâs hair-like stereocilia may get damaged or broken. If enough of them are damaged, hearing loss results. The high frequency area of the cochlea is often damaged by loud sound.
However, this results in extremely high frequencies, far higher than those that any known species can perceive (some bats can hear frequencies as high as about 250,000 Hz). Rodents can generally hear higher frequencies than humans. It's difficult to give an average frequency for the hearing ability of rats, but it would be much higher than for people. The hearing range for rats is about 200-75,000 Hz. Beyond that, I can't really answer your question, as I'm not really sure what you are requesting; hopefully this helps somewhat!