Although the Copernican system was largely correct to place the Sun at the center of all planetary motion, themodel still gave inaccurate predictions for planetary positions. Explain the flaw in the Copernican model that hindered its accuracy.

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

Diamond will scratch quartz. true or false

Individuals who live below the poverty line get seriously ill more often than those who do not what could be the hidden variable in this situation?