1. Which of the following best describes the independent variable in Anna and Joe's experiment?
O what kind of heart medicines the person is taking
O how fast the heart is beating
O how much exercise the person is doing
O how much stress the person has before exercising

Which would best keep the oxygen cycle stable? a. cutting down jungles to create farmland b. eliminating parks in large cities c. dumping toxic chemicals into the ocean d. reducing the amount of deforestation d. reducing the amount of deforestation

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.

Explain the process that creates the heat of the sun?