What is the approximate length of the geologic time scale?
A) 50 million years
B) 50 billion years
C) 5 million years
D)5 billion years

D; 5 billion years

Explanation: The age of the Earth now is estimated to be 5 billion years old! Lots of this evidence is maintained by asteroids and different bodies of rock that hit earth and leave behind a rubble of rocks that could be dated back by geologists back to the time that the earth was cooling.

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Ps. It would mean a lot if you marked brainliest :)

as resources become scarce because of population growth, the growth decreases after few years due to lack of resources and food.

endo:

regulates body hormones, aldosterone, vasopressin

neural:

signal, regulates body using electric signals, reflex

endo has to do with hormones; aldosterone and vasopressin are both hormones. i also had this question and got it right : d