PLEASE HELP What is the independent variable in the following testable question? Does changing the height of a ramp affect how far a car will travel?

Question 1 options:

the type of car

height of the ramp

how far the car will travel

the type of material the ramp is made out of

1 first one

Explanation:

firearm identification is the process of analyzing the bullets and cartridge cases left at a crime scene to determine if they came from a particular firearm. marks on the bullets and cartridges may be common to every firearm of that type. these are called class characteristics.

the skeletons of most mammals reach a certain size and then stop growing. however, many animals, including some mammals, keep growing throughout their lives. kangaroos, for example, just keep growing and growing until they die. also, the longer an animal lives the greater the chance it might catch some deadly disease.