Using GCSE Physics: What percent has decayed after 1 half-life?
1. 50%
2. 25%
3. 75%

The transport tubes for food coming down the plants are called?

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?

There are fewer than 100 naturally occurring elements in the universe, but there are millions of different unified substances. explain how this can be true.