What is the difference between negative feedback and positive feedback?

Most scientific questions are based on opinions. hypotheses. observations. experimental data.

Some birds look for food near cattle and other livestock. the movement of the cattle churns up the ground, making insects available to the birds. the cattle appear to be unaffected by the presence of the birds. what kind of relationship exists between the birds and the cattle? o a. parasitism o b. commensalism o c. predation o d. mutualism

Which of the following is a macronutrient? carbohydrates lipids amino acids all of the above