An avocado can be a simple model of the structure of a eukaryotic cell what cell structure is represented by the seed in the center ?

Which of the following was a social cost associated with the development of the internal combustion engine used in most cars? a. people were able to use their horses for new tasks. b. new jobs were created. c. blacksmiths needed to gain new skills to continue working. d. families were able to travel farther more easily.