Please help! whoever answers this first and explains why the answer they chose is right I will mark brainliest!!

The relationships that organisms have with one another are an important part of the balance among species within ecosystems. Which type of symbiotic relationship occurs when ecological niches overlap and multiple organisms seek the same resources?
A. Parasitism
B. Commensalism
C. Predation
D. Competition

Question 1 which of the following allows cells to take in fluids? a. phagocytosis b. pinocytosis c. exocytosis d. receptor-mediated endocytosis question 2 molecules move along their concentration gradient (from areas of high concentration to low concentration) using active transport mechanisms. a. true b. false question 3 which of the following powers active transport (ie. provides the energy for)? a. glucose b. transport proteins c. atp d. phospholipids question 4 what type of lipid is a major component of the plasma membrane? a. cholesterol b. phosopholipids c. proteins d. triglycerides