Why do astronomers use astronomical units (AU) instead of kilometers (km)?(1 point) A There are no km in outer space, only AU.

B AU is used in astronomy, while km is used in physics.

C Large distances are easier to express in AU than in km.

D AU is used for spacing, while km is used for length.

Paint and solvents pose no potential hazard to human health. select the best answer from the choices provided t f

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

What is a group of organisms called