In a study of energy flow, the following data were collected:

Each human requires 55 grams of protein per day.
An acre of soybeans produces 200,000 grams of protein per year.
A cow grazing on one acre of land produces 19,000 grams of protein per year.

Based on these data, an acre of land would support:

10 humans per year on a diet of soy, or 0.9 human per year on a diet of beef.

What is the statements that best explains these relationships in terms of energy transfer?

In 2009, a flu pandemic was believed to have originated when viral transmission occurred from pig to human, thereby earning the designation, "swine flu." although pigs are thought to have been the breeding ground for the 2009 virus, sequences from bird, pig, and human viruses were all found within this newly identified virus. what is the most likely explanation of why this virus contained sequences from bird, pig, and human viruses? a) the virus was descended from a common ancestor of bird, pig, and human flu viruses.b) the infected individuals happened to be infected with all three virus types.c) related viruses can undergo genetic recombination if the rna genomes mix and match during viral assembly.d) the human was likely infected with various bacterial strains that contained all three rna viruses.

The hydrologic, carbon, nitrogen, and phosphorus cycles are essential to the . this is why they are called biogeochemical cycles.

Which of these contraceptive methods on its own is least likely to prevent pregnancy ? a. spermicides b. condoms c. surgical sterilization d. oral contraceptives