Either A or D I’m not 100% sure but it’s the only thing that makes since
Answer:
If the petri plates are kept open for the longer duration of time then there are chances of cross contamination.
The contamination can be defined as growth of undesired microbes in the petri dishes or tubes which is no longer useful for the experiment.
The tube if kept open will develop the growth of contaminants in it. It can be cross contamination as well.
To avoid contamination the tubes and dishes should not be kept open for a longer duration of time.
Answer:
the movement of ions or molecules across a cell membrane into a region of higher concentration, assisted by enzymes and requiring energy.
There are omnivores, carnivores, herbivores, and decomposes. Omnivores eat both plants and animals, carnivores eat animals, herbivores eat plants, and decomposers feed on dead material.
