In what system is a person a status at birth and remains at that level throughout life?
a. a caste system
c. a closed system
b. an open system
d. a class system

How can you approximate the number of calories required to keep you in energy balance?

As a small change in a person's dna can cause a genetic disorder

You are given an electron micrograph of a bacterial cell. in the micrograph you can clearly see three thin layers of different densities surrounding the cell. based on the micrograph, you can infer that this cell is and would appear after application of the gram stain procedure. gram-negative / pink gram-positive / purple gram-positive / pink gram-negative / purple