When an electric current flows through a wire, the current produces which of the following?

a. a magnetic field

b. mechanical energy

c. a generator

d. a motor

Most scientific questions are based on opinions. hypotheses. observations. experimental data.

Flock x flock y flock z total pieces of food eaten (from previous page) 147 93 60 food percentage* % % % simulated number of birds in flock for 3rd generation** * divide each flock's total pieces of food by 300, the total number of pieces of food eaten. ** multiply the food percentage for each flock by the total number of birds (30).

If bacteria are much too small to see, what is one reason why can we see colonies in the petri dishes that have plenty of food to eat after only a few days?