Chicken and Egg.
The egg obviously came first. Eggs adapted for surviving on land (amniote eggs) evolved with reptiles. Some of those reptiles evolved into birds, which are loaded with reptilian characteristics. Then some of the birds differentiated into the group which includes chickens.
So, the egg came long before the chicken.
DINOSAUR means literally “terrible (as in terrifying) lizard.” However, the Greek root meaning lizard is used in this terminology to mean merely reptile (any kind of reptile). For example, we have pterosaurs (flying reptiles).
Dinosaurs are members of the Order Archosauria (”ruling reptiles”) and are NOT lizards. They are not even just big lizards. Lizards belong to a different order, allied with snakes.
There are only four living orders of reptiles on Earth today: Archosauria (represented by the crocodilians); Squamata (snakes, worm snakes, and lizards); Chelonia (turtles); and Rhynchocephalia (represented by a single species, the Tuatara, from New Zealand).
It is too bad that so many popular books keep saying that the -saurus root means “lizard,” when actually in context it signifies reptile.
There is a similar word, greek root “ther”, which literally means “beast,” but which in scientific Greek signifies mammal.
Yet all 'evolutionary' evidence we see today is evolution towards extinction, not improvement. degradation, not betterment.
It's a wonderful theory, yet not a lick of evidence to prove it, in fact it all proves the opposite.