Aplant cell has both a cell membrane and a cell wall. how are they different and what is the purpose of both?

Nitrofurantoin used during the fifth week of pregnancy places the neonate at risk for which condition?

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?

Explain how paleontologists use trilobite fossils as index fossils for various geologic time periods.