Once a niche is left vacant, what happens? a The niche disappears
b A new species evolves to fill the niche
The niche adapts for an existing species

What’s the scientific notation for the number 6,840,000,000

What does the cell nucleus do or, how does it function?

*will mark you brainliest + 15 points ** why does the equilibrium of a system shift when the pressure is increased? a. to maximize the stress on the system b. to stop restoring equilibrium to the system c. to increase the total moles of gas in the system d. to decrease the total moles of gas in the system