In most bacterial operons, such as the lac operon, which of the following dna segments is responsible for controlling whether the operon is off or on?

a. lacy gene.
b. promoter
c. operator
d. repressor

Organisms that successfully adapt will leave to grownone of the above

Which animal is a producer in this ecosystem

What's wrong with this ecological pyramid? (multiple choice)1. secondary consumers should be at the bottom of the pyramid2. the sun has an arrow leading to decomposers 3. primary consumers should come after the sun4. energy retained should increase from the bottom to the top5. the sun should be at the bottom of the pyramid