What can cause cancer to develop? A. Synthesis of a repressor protein

B. Disruption of the cell cycle

C. Turning off of genes during differentiation

D. Structural genes that are active

Sydney drew a flow chart to illustrate the nitrogen cycle. which labels best complete the flow chart? x: producers undergo photosynthesis. y: nitrogen compounds are released into the air. x: nitrogen compounds are released into the air. y: producers undergo photosynthesis. x: free nitrogen is in the atmosphere. y: producers absorb nitrogen compounds through their roots. x: producers absorb nitrogen compounds through their roots. y: free nitrogen is in the atmosphere.

Which mantle is under the crust the upper mantle or the lower mantle i think it's upper let me know if i'm right

What would happen to the nutrients in an ecosystem if decomposers, such as bacteria, didn’t exist there?