Endogeny (biology)
Endogenous substances and processes are those that originate from within an organism, tissue, or cell.
Endogenous viral elements (EVEs) are DNA sequences derived from viruses that are ancestrally inserted into the genomes of germ cells. These sequences, which may be fragments of viruses, or entire viral genomes (proviruses), can persist in the germline, being passed on from one generation to the next as host alleles.
Endogenous processes include senescence, the menstrual cycle and the self-sustained circadian rhythms of plants and animals.
In some biological systems, endogeneity refers to the recipient of DNA (usually in prokaryotes). However, because of homeostasis, discerning between internal and external influences is often difficult.
Endogenous transcription factors refers to those that are manufactured by the cell, as opposed to cloned transcription factors.
Etymology
The word endogenous /ɛnˈdɒdʒɪnəs/ derives from the Ancient Greek ἐνδο-, "inside" and -γενής, "coming from".
Endogeneity (econometrics)
In statistics, an endogeneity problem occurs when an explanatory variable is correlated with the error term. Endogeneity can arise as a result of measurement error, autoregression with autocorrelated errors, simultaneity and omitted variables. Two common causes of endogeneity are: 1) an uncontrolled confounder causing both independent and dependent variables of a model; and 2) a loop of causality between the independent and dependent variables of a model.
For example, in a simple supply and demand model, when predicting the quantity demanded in equilibrium, the price is endogenous because producers change their price in response to demand and consumers change their demand in response to price. In this case, the price variable is said to have total endogeneity once the demand and supply curves are known. In contrast, a change in consumer tastes or preferences would be an exogenous change on the demand curve.
Exogeneity versus endogeneity
In a stochastic model, the notion of the usual exogeneity, sequential exogeneity, strong/strict exogeneity can be defined. Exogeneity is articulated in such a way that a variable or variables is exogenous for parameter 
. Even if a variable is exogenous for parameter , it might be endogenous for parameter 
.
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All I Want To See
by: IndigenousWill you miss me when I'm gone, will your nights still feel the sameOr will you cry when you're all aloneWill your tears fall like rain, will you feel all the painOr will you cry when you're all aloneChorus: All I want to see, all I want to beIs everything you need, always in my soulYou will beTell me what you want me to do, tell me how you feel is trueOr will you cry when you're all aloneTell me if you will see this through, tell me because I'm lost without youOr will you cry when you're all aloneChorus 2: All I want to see, all I want to beIs everything you need, always on my mindYou'll beBridge: All I need to know, is that you won't let go And we will be alright, you will see, oh you will see