CO2 traps heat in the atmosphere of the earth which leads to global warming because of the green house effect
Zambia
The other three are already well established.
The answer is an embryonic stage. This is the period of gestation right after the implantation, this is when the major organs of a baby are formed.
In the embryonic stage, <span>ectoderm is the outer layer that develops to a hair, teeth, brain and spinal cord. </span>
Though there's no question in the statement above I would assume that you are asking about the pH of the water that is acidic. The correct statement would be:
Any liquid that has a pH less than 7 is called acidic, a pH above 7 is basic or alkaline.
The water in the swimming pool has a high acid concentration due to the chlorine which causes the effect of redness in the eyes.
Atmosphere of the early earth + lighting = paleolightning
