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?

explanation: grsaa

the growth of the plants is affected by the heat of the light. what is the student doing?

for example, no new evidence will demonstrate that the earth does not orbit around the sun (heliocentric theory), or that living things are not made of cells (cell theory), that matter is not composed of atoms, or that the surface of the earth is not divided into solid plates that have moved over geological timescales .

i think the answer is a.keratin is the pigment responsible for skin color.