Which statement describes Redi’s experiment, which helped disprove spontaneous generation?

A)He examined covered and uncovered meat to determine that maggots came from eggs.
B)He heated milk to show that it could destroy bacteria.
C)He wrote a book on how cells come from other cells through reproduction.
D)He showed that the shape of a flask was important to the experiment.

What volume of a 0.25 m solution can be made using 0.55 moles of ca(oh)2

Keeping in mind the life cycle of bacteriophages, consider the following problem: during the reproductive cycle of a temperate bacteriophage, the viral dna inserts into the bacterial chromosome where the resultant prophage behaves much like a trojan horse. it can remain quiescent, or it can become lytic and initiate a burst of progeny viruses. several operons maintain the prophage state by interacting with a repressor that keeps the lytic cycle in check. insults (ultraviolet light, for example) to the bacterial cell lead to a partial breakdown of the repressor, which in turn causes the production of enzymes involved in the lytic cycle. as stated in this simple form, would you consider this system of regulation to be operating under positive or negative control?

Is there any solid scientific evidence that humans have been cloned?