1. laura uses a cotton swab to collect microorganisms from a hand rail and streaks a plate. on the fourth day of incubation, she does not observe visible microbial growth. given that microorganisms are literally everywhere, give at least three reasons why laura may not have observed microbial growth?

The Laura tried to grow micro-organisms in culture broth medium in Petri-plates but the microbial growth was not observed even on the fourth day of culture which could be due to:

1. Laura could have not provided the correct broth medium maintaining the with pH and salt concentrations.

2. Microorganisms did not get optimal growth conditions.

3. The bacterial source could have died after the collection which could have lysed after their death and thus no longer visible.

can you give me more to work here with plzs and you

a plastic spoon that has a temperature of 78° f is placed into a bowl of soup that has a temperature of 84° f. which of these correctly describes what will happen?

energy as heat moves from the soup to the spoon.