What organism is responsible for fixing atmospheric Nitrogen into a usable form for producers?

Chicken pox and hepatitis are bacterial diseases. true or false?

Which equation is used to calculate the magnetic force on a charge moving in a magnetic field

What would be the result if crossing over did not happen during meiosis in humans? a. there would be less genetic variation in humans. b. parents would be more likely to look like their children. c. the human population could not reproduce. d. children would have more chromosomes.