Toddlers should consume milligrams of calcium per day.

The answer is 700 milligrams needed toddlers should consume per day. Children need enough calcium to support their growing bones and teeth. Calcium is one of the body's most essential minerals and also has other necessary roles to play, including supporting a healthy nervous system and muscle function.

the answer is; comparing the frequency of collisions with and without the device

this makes the anti-collision system an independent variable and the collisions a dependent variable. if there are fewer collisions with an anti-collision system that without, then it can be stated that the system is a success. essentially, collisions under an anti-collision system are compared with the frequency of collisions by cars with the human drivers.