Which alternate energy source would be expected to be at least dependent upon the whether

What did pavlov initially notice about the animals in his original research after conditioning took place?

How are 3-d printers useful in studying evolution? a. to color the fossils of organisms b. to create clones of extinct organisms c. to create replicas of fossils d. to prepare paper cutouts of organisms e. to study the composition of fossils

What is 7/81 as a percentage? round your answer to the nearest tenth of a percent.