Does anyone know what "d" is pointing to and what it's called? pic shown

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 . .”

Barbara is converting 78°f to degrees celsius. first, she subtracts 32 from 78. what is the next step?

Which of the following systems in absorbing oxygen and releases carbon dioxide