Sau khi được chuẩn đoán viêm màng phổi nặng, bác sĩ đã kê cho bệnh nhân một toa thuốc dài gồm toàn các loại đặc sản. Nhờ mn chữa lỗi dùm mình câu này.

Efficiency is the percent of work put into a machine by the user (input work) that becomes work done by the machine (output work)

1. emigration the movement of people from one place to another 2. immigration a situation in which resources are being used up at a faster rate than they can be replenished 3. migration the leaving of one's homeland to settle in a new place 4. overpopulation the movement of people to a new country 5. sustainable development a situation in which the birth rate is not sufficient to replace the existing population 6. underpopulation the ability to meet current needs without reducing the ability to meet future needs 7. unsustainable development the increase in the population of a city 8. urbanization a situation in which the number of people exceeds the available natural resources in an area

Which statement best describes the relationship between an allele and a gene? question 1 a. an allele is a variation of a gene that can be expressed as a phenotype. b. an allele is the part of a gene that attaches to messenger rna molecules. c. an allele is a segment of a dna molecule that controls replication of a gene.