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I'm red, but I can also be blue
When in a lizard, I might be green

I'm thicker than water,
and I have a slightly higher density.

I have to do something with a monkey,
but the connection might be negative

I symbolize both life and death

What am I?

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Blood?

I'm red, but I can also be blue

humans have red blood, but nobles were sometimes referred to as having blue blood because they never went outside

When in a lizard, I might be green

some lizards have green blood

I'm thicker than water, and I have a slightly higher density.

"Blood is thicker than water"

I have to do something with a monkey, but the connection might be negative

Rhesus factor (Thanks, @RadoslavHristov!)

I symbolize both life and death

You need blood to live, but bloody is often negative and connected with death

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    $\begingroup$ The monkey link is the rhesus factor. Also insects have no blood so I guess we have a reference to royal, i.e. "blue" blood. $\endgroup$ – rhsquared Jul 26 '16 at 9:36
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    $\begingroup$ This was the intended answer. Indeed, blue is a reference to royal. Also, Cephalopods (inkfish) in fact have blue blood. $\endgroup$ – wythagoras Jul 26 '16 at 9:46
  • $\begingroup$ If it's not obvious, the "might be negative" part refers to the Rh factor in the blood type, which can be positive or negative like o-positive or ab-negative, for example. $\endgroup$ – Eyal Jul 26 '16 at 10:47

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