Which of the following statements describes a benefit of modern refrigeration?
a. homes use less energy.
b. perishable items can be kept safely for longer.
c. poultry no longer is contaminated by salmonella.
d. fresh fruit does not need to be washed before consumption.

The answer is the option B. Perishable items can be kept safely for longer.

Refrigeration is an excellent way to preserve food longer due to the inhibition of microrganism growing at low temperatures.

In the past some perishable items like fruits, milk, vegetables, and meat, among others had to be consumed very shortly after having them. Nowadays refrigeration permits to keep those items for many days: weeks or months in some cases.

Humans have survived and thrived in mexico city by using technology to create greater access to land. when the spanish conquered the aztec capital, tenochtitlan, in the 16th century, they built mexico city by draining the lakes and filling in the lake water to create more arable land for agriculture. this technique of land reclamation has continued to be fundamental to human civilization in mexico city. 

The scientist can conclude that there is a decrease in the natural resources due to human activities. because of innovation and modernization of the environment, then there goes pollution and other bad effects that destroys the natural resources.