Jeffery inoculated a tryptone broth tube with e. coli. when he examined his broth tube during the next lab period, there was no growth at all. what could have gone wrong with his experiment?

Johnny rode his bike to a friend's house 4 blocks down the street in his neighborhood. he immediately rode back home once he realized his friend was not able to play. what was his displacement for the total bike ride? how did you determine this? what could we use as a reference point to determine he was in motion during his bike ride? why can you use it as a reference point

You are observing different types of cells in your science lab. one cell has many chloroplasts. what is the most likely function of this cell? a. energy production b. photosynthesis c. reproduction d. digestion

Which of the following is the sl unit used to measure temperature a. kilogram b. liter c. meter d. kelvin