Jack has harvested a cereal crop. Without using fertilizer, how can he increase the field's soil fertility?

A. cultivate corn or oats

B. cultivate any leguminous plant

C. cultivate any kind of grass

D. keep the soil waterlogged

Which of the following produces carbon dioxide? a. plants b. animals c. decomposers d. all of the above

Which of the following cell structures is significantly different between gram- positive and gram-negative bacteria?

Pls me i need this ! each cell has genes activated depending on it's job and what kind of cell it is. it is the presence of that causes the repressor protein to fall off and unblock the gene on the lac operon. if a gene is turned on then it is being an additional circular chromosome found in some bacteria that is used in genetic engineering.