What is the difference between a closed and an open circulatory system? a. an open system has capillaries and blood vessels c. a closed system lacks capillaries b. a closed system has capillaries and blood vessels d. in a closed system blood bathes the tissues directly

Which of the following is an example of a tissue on the digestive system a.the stomach b.smooth muscle that lines the stomach c.nerve cells in the stomach d. enzyme molecules in the stomach

Hummingbirds drink nectar from flowers, while robins eat plant seeds. what does this reduce?

How does the diagram explain ocean currents? earth tilt 23.5 degreesquestion 1 options: earth's tilt causes uneven heating of earth which causes currents.earth's tilt causes the ocean to move because of gravity.earth's tilt and its rotation cause currents.earth's tilt causes uneven distribution of salt which causes currents.