Can anyone help me with my homework

Compare and contrast nutrient limitation in soil vs. nutrient limitation in aquatic ecosystems

Which of the following statements about c4 carbon fixation is not true? a c4 carbon fixation is an adaptation for plants exposed to high light intensityb. c4 carbon fixation occurs in more plants than c3 carbon fixation.c c4 carbon fixation is more common in areas of high temperatures than c3 carbon fixation.d. c4 carbon fixation occurs in the inner cells of a leaf rather than the entire leaf.

What is turgor pressure, what causes it, and what does it do for a plant?