I believe the answer is 20 feet. According to McBurney and Collings, the average threshold of human hearing is the tick of a watch from 20 feet in very quiet condition.
The human hearing range is a description of the pitches and loudness levels a person can hear before feeling discomfort. There is a variety of sounds in our environment, ranging from faint sounds like birdsong and rustling leaves to louder sounds like music, yelling, and industrial noise.
Answer:
The correct answer is phytochemicals.
Explanation:
Phytochemicals refer to the components, which are generated by plants. They are witnessed in vegetables, fruits, beans, grains, and other plants. Some of these phytochemicals are considered to protect cells from destruction, which could result in cancer. The phytochemicals are not considered as nutrients, but possesses many health benefits:
1. It helps in ceasing carcinogens from attacking cells.
2. It helps to prevent the generation of potential cancer-resulting substances.
3. It assists the cells to prevent and eradicate any kind of cancer-like modifications.
Some of the phytochemicals, which are considered as the most beneficial ones are polyphenols in tea, beta-carotene and other carotenoids in vegetables and fruits, and isothiocyanates found in cruciferous vegetables.
1.) Population density.
2.)Growth rate.
3.)Birth rate.
4.)Death rate.
