The atomic number of an atom is the number of

a. protons and neutrons

b. neutrons

c. electrons and neutrons

d. protons

Nasa scientists must work together to make sure that everything is correct and accounted for when launching a shuttle. besides a physicist, what other type of scientist would be in making sure that the shuttle has the appropriate type and amount of fuel to reach its destination?

Jason adds the antibiotic penicillin to a bacterial culture. the bacteria develop genetic modifications in their genome, which gives them resistance to the antibiotic penicillin. what caused this genetic modification?

Chloroplasts and bacteria are in size. a. similar b. at different ends of the size range c. exactly the same d. none of these