Which statement about plant classification below is true?
A. All vascular plants are angiosperms, but not all nonvascular plants are mosses.
B. Not all nonvascular plants bear seeds, but all vascular plants do bear seeds.
C. No nonvascular plants bear seeds, but not all vascular plants bear seeds.
D. Not all angiosperms produce flowers, but all gymnosperms produce cones.

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?

How do ratio scale and diagrammatic scale work

20 how are energy cycles and growth cycles related?