Short pieces of RNA called micro RNAs play a role in cellular differentiation  acting in synchrony with protein transcription factors together the microRNAs protein transcription factors- A) prevent proteins that regulate gene expression within the cell from affecting the cell
B) destroy proteins that regulate gene expression within the cell
C) produce proteins that regulate gene expression within the cell
D) capture proteins outside the cell to regulate gene expression within the cell

measuring light intensity

light meters can be used to measure light intensity. the meter is held at the soil surface and pointed in the direction of the maximum light intensity, and then the meter is read.

errors can be made when measuring light intensity by accidentally shading the light meter. the reliability of the results can be checked by taking many samples.

condenser is used to focus in the light microscope.

cuz some people don't have enough food. that's why we need more ppl to donate food to the hungry.