the four sources of calories area.  carbohydrates, fiber, fat, and vitamins.      b.  carbohydrates, proteins, fats, and alcohol.      c.  carbohydrates, proteins, fats, and sugars.      d.  carbohydrates, fats, sugars, and cholesterol. 

The part of the nephron provides initial filtering of the blood in the urinary system.

Which of the following processes within viral replication is the greatest source of genetic variation in rna virus populations? a) high mutation rate due to lack of proofreading of rna genome replication errors.b) transcription from the host cell rna polymerase introduces numerous mutations.c) capsid proteins from the host cell can replace the viral capsid.d) viral rna is translated by host cell ribosomes.

What factors characterize a healthy relationship that contributes to positive social well-being?