Which element is the primary fuel used to generate electricity using nuclear energy?

What is the correct trna sequence that would match the following mrna sequence. gcgaua

An ecologist studied the same species of deer during the summer and the winter. she noticed that during the summer, when there was plenty of food, the deer were energetic and playful. however, during winter when food was scarce, the deer moved more slowly and did not run unless they needed to escape a predator. which scientific fact is best supported by her observations?

Which of the following was not a major animal on land during the carboniferous period? amphibians insects both a and b none of the above