The table below shows the level of carbon dioxide in the atmosphere for a period of 50 years. What conclusion can you make about how the carbon dioxide level has changed over time?

The level has not changed.

The level of CO2 has declined.

The level of CO2 has risen. The table below shows the level of carbon dioxide in the atmosphere for a period of 50 years.

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

If forces acting on an object are unbalanced. true or false

Select all the correct answers. which three statements about electromagnetic radiation are true?