How does this action cause the skateboarder's speed to decrease?
A. It increases the force of friction.
O B. It increases the maximum static friction of the
skateboard.
C. It increases the net force down the hill.
O D. It decreases the force of friction.

What is one affect on the australian environment due to the introduction of non-native european rabbits? (a) more grass grew in response to the need of the growing population of rabbits. (b) the rabbits balance out the food chain as they became a natural prey to many predators. (c) the rabbits the land by digging, which caused the soil to spread much needed nutrients. (d) the rabbits out-competed other small animals species and caused them to go extinct.