You are building a model plane that needs small blocks inside to balance weight. You find that the block material you are using has half the density you thought I did you still need the same way for the blocks in the plane and they must have the same width and length. How can you keep the weight same?

Which of the following is an example of a non-falsifiable hypothesis? a. there is a teacup orbiting the milky way galaxy. b. there is no life on mars. c. the human species started in africa. d. humans cannot live without the amino acid methionine

Which is the correct formula for photosynthesis

The current thought on the structure of the cell membrane is: a. a static phosphate sandwich of lipids b. a fluid-mosaic of phospholipids and proteins c. a bilayer of proteins with static lipid molecules d. an impermeable bilayer of protein molecules e. a static and permeable phospholipid single layer