Would a positive feedback loop ever be in maintaining homeostasis

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.

Researchers want to use edna to look for an invasive species in the water which of the steps would be likely do last

Which kingdom includes some organisms that have no nucleus and can live in an environment with an extremely high salt content