A zebra is running away from a lion and covers a distance of 56 min 7 seconds, what is the speed of the zebra?

In which situation has the independent variable for the experiment been changed? check all that apply. changed from counting the number of duckweed at day 0 and day 14 to counting them every day changed from testing duckweed growth in beakers to testing duckweed growth in large outdoor tanks changed from testing the effect of ph on duckweed growth to testing the effect of light levels on duckweed growth changed from testing the effect of acid ph on duckweed growth to testing the effect of basic ph on duckweed growth

The ph is the a. independent variable b. the dependent variable c. control group

Area around a charged object where the objects can exert a force on another charged objects is an electric