Which provides evidence that humans are causing an increase in the carbon dioxide concentration in the atmosphere?

A. The net flux of carbon into the atmosphere without including the contribution from burning fossil fuels is positive.

B. The net flux of carbon out of the atmosphere without including the contribution from burning fossil fuels is zero.

C. The net flux of carbon into the atmosphere without including the contribution from burning fossil fuels is negative.

D. The net flux of carbon out of the atmosphere without including the contribution from burning fossil fuels is negative.

Explain the difference between each pair of concepts. a. frequency and relative frequency b. percentage and relative frequency a. select the correct choice below. a. frequency is the total number of observations in a data set. relative frequency is the number of times a particular distinct value occurs. b. frequency is the number of times a particular distinct value occurs. relative frequency is the ratio of the frequency of a value to the total number of observations. c. frequency is the total number of observations in a data set. relative frequency is the ratio of the number of times a particular distinct value occurs to the frequency. d. frequency is the number of times a particular distinct value occurs. relative frequency is the ratio of the frequency of two different values.

Which model displays the change in a gas when the temperature of the gaseous system decreases?

Amaterial that provides resistance to the flow of electric current is called a(an) (1 points)