What are four things that laws and theories have in common

When does the circulatory system work with the respiratory system? a. during blood cell formation b. during cellular respiration c. during intestinal digestion d. during a viral infection

Which of the following is not a symptom of desertification? a) decrease in salt content of the soil b) lowering of the water table c) reduced surface water d) increased soil erosion e) loss of native vegetation

In the diagram below, the northern hemisphere would be in what season at position a a.fall b. winter c.summer d.spring