PLZZ HELP BIG GRADE AND I DON'T KNOW A sea bird builds its nest on a ledge above the ocean, where it fishes for food. When does the bird have the most potential energy?

A. flying at 10 m/s 10 m above the ocean
B. sitting in its nest 20 m above the ocean
C. swimming on the ocean surface at 2 m/s
D. diving for fish 3 m below the ocean surface

The image shows ekgs of a person with normal heart waves and of a person having tachycardia. based on this image, what kind of condition is tachycardia? a. the heart beats abnormally fast. b. the heart beats abnormally slow. c. the right atrium of the heart stops working. d. the left ventricle pumps less blood to the aorta.

All individuals have two alleles for a given trait. according to mendel's these alleles are passed down one each from both mother and father.

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?