8. Populations 1

Under ideal conditions with unlimited resources, a population will increase exponentially. This means that the larger the population gets, the faster it grows.

In a hypothetical experiment with a single bacterium that divides to produce two cells every 20 minutes. In a few days, this bacterial population would cover the planet!

Real-world populations show the characteristic S-shaped curve of_______________ growth. As resources become limited, population growth slows or stops, leveling off at the carrying capacity.

Logistic growth occurs when a population's growth slows and then stops, following a period of __________ growth.

A population will stop growing when a population's _____ and death rate are the same, and when immigration equals emigration. 

A__________ factor is any factor that controls the growth of a population.

Acting separately or together, limiting factors determine the__________ capacity of an environment for a species.

Density-dependent limiting factors include competition, stress from overcrowding, __________, disease, predation, and herbivory.

Environmental extremes including weather extremes such as hurricanes, droughts, or floods, and natural disasters such as wildfires--can act as density  ________ limiting factors. In

If carrying capacity falls low enough, populations can be wiped out, leading to species _________.