What is one positive effect that prey have on a predator population? a. prey populations that decrease provide for consistent predator populations. b. prey populations that increase provide for lower predator populations. c. prey populations that increase provide for higher predator populations. d. prey populations that decrease provide for higher predator populations.

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 an experiment examining the effects tai chi on arthritis pain, callahan (2010) selected a large sample of individuals with doctor-diagnosed arthritis. half of the participants immediately began a tai chi course and the other half (the control group) waited 8 weeks before beginning. at the end of 8 weeks, the individuals who had experienced tai chi had less arthritis pain that those who had not participated in the course.

Describe your dna model. which part do the straws represent? the pushpins? the paper clips and the black dots you made with the marker?