A student wonders if adding fertilizer to the soil will make tulips grow faster. The students hypothesis states if fertilizer is added to the soil then the tulips will grow faster because fertilizer adds nutrients to the soil. Which of the following is the independent variable

What can be said about farmers in highly developed countries? a) they have little or no negative impact on the environment. b) they practice subsistence agriculture. c) they are able to incorporate polyculture into their farming practices. d) they utilize organic farming techniques on a regular basis. e) they rely on large amounts of energy from fossil fuels.

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?