The surface area of a cell is 4x10-6m2. The volume is 2x10-6m3. What is the surface area to volume ratio of the cell?

Which phrase is most likely to start a description of a scientific theory? “what i have found through my online research is . .” “after much thought, i believe that the best explanation is . .” “based on the observations made and experiments performed over the last fifty years . .” “if sunlight shines on the right side of a plant, then the plant will grow toward the right because . .”

According to the law of conservation of energy, energy can neither be created nor destroyed. if this is true, why is there less energy in the top of the energy pyramid than there is in the bottom of the energy pyramid?

How is the male reproductive system different from other body systems? it isn’t necessary to vital signs. it monitors other body systems, and adjusts if necessary. it transports items from one system to another. it is the only system that produces hormones in the male.