Parenchyma cells

Mature parenchyma cells have primary walls that are relatively thin and flexible, and most lack secondary walls

Mature parenchyma cells have a large central vacuole

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#Id: 8421

#XL - T Zoology

Human populations can exist at equilibrium densities in one of two ways:

1. High birth and high death rates

2. Low birth and low death rate

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#Id: 8422

#XL - T Zoology

The difference between the birth rate and the death rate determines the rate of natural increase or decrease

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#Id: 8423

#XL - T Zoology

Parental investment - The amount of time and energy given to an offspring by its parents. 

Longevity - The life span of an organism. Also known as Life expectancy

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#Id: 8424

#XL - T Zoology

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#Id: 8425

#XL - T Zoology

Fecundity - The number of offspring produced by an organism per reproductive episode. 

Parity - The number of reproductive episodes an organism experiences. 

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#Id: 8426

#XL - T Zoology

Senescence - A gradual decrease in fecundity and an increase in the probability of mortality.