In chemistry you learned about open and closed systems. Which of the following is a true statement about the human body. O A. The human body is a closed system because matter and energy move from one part of the body to another.
OB. The human body is an open system because you need to take in air and food for the body to function.
OC. The human body is a closed system because normally the organs, tissues, and cells are all internal to the body.
D. The human body is an open system because the circulatory system moves food around from one part of the body to another.

Explain how the energy of rubber ball is tranforned as it roll down a ramp. give evidence that the energy of the og the ball remains the same at all points on the ramp

Which levels of government establish and implement educational requirements for minors

Arunner is jogging at a steady 3.6 km/hr. when the runner is 2.9 km from the finish line, a bird begins flying from the runner to the finish line at 14.4 km/hr (4 times as fast as the runner). when the bird reaches the finish line, it turns around and flies back to the runner. even though the bird is a dodo, we will assume that it occupies only one point in space, i.e., a zero-length bird. how far does the bird travel? (b) after this first encounter, the bird then turns around and flies from the runner back to the finish line, turns around again and flies back to the runner. the bird repeats the back and forth trips until the runner reaches the finish line. how far does the bird travel from the beginning? (i.e. include the distance traveled to the first encounter)