State whether each water pollutant listed below is primary or secondary and whether it is physical, chemical, biological, radiological, or thermal

How does the study of genetic disorders such as pku biologists understand normal alleles?

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 is a period in the paleozoic era? devonian cambrian permian all of the above