Many plants contain mixtures of volatile monoterpenes and sesquiterpenes, called essential oils examples- Peppermint, lemon, basil, and sage 

Chief monoterpene constituent of peppermint oil is menthol; that of lemon oil is limonene

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#Id: 8420

#XL - T Zoology

Human population growth fits an exponential pattern

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

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

Parity - The number of reproductive episodes an organism experiences.