In this picture, the squirrel is on top of a tree. We were able to describe the position of the squirrel because we used the tree as a basis of its position. The object used as a basis of the position of another object is called ______________.

motion
reference point
force
position


Which of the following is an interaction between a living and nonliving thing? *

plants absorbing water
farmers harvesting crops
a boy feeding his pet
goat eating grass