prior to the industrial revolution, what was the previous highest level of co2 concentration in the atmosphere over the prior 400,000 years?

For all machines-not just hammers- the user applies force force to the machine to the machine over a certain distance. a. input b. output c. duo d. none of the above

The next button in the review section shows the next available comment. next slide with no comment. previous comment. edited comment.

Complete the sentence about a presentation delivery method