The correct answer for question number 1 is A - eukaryotes are the name
for unicellular organisms that dominated earth up to the Precambrian
times.
The correct answer for question number 2 is C - the
greenhouse effect is related to the phenomenon of an increase in average
surface temperature known as global warming.
The correct
answer for question number 3 is D - the colourless and odourless gas
that is produced by the radioactive decay of Uranium-238 and is considered
to be a cancer-causing agent is Radon.
The correct answer for
question number 4 is B - Scientists can determine if oxygen existed in
Earth's Archean atmosphere by looking for oxidized iron in rocks.
It needs a C) host cell in order to reproduce
Heat from the Sun causes water<span> to evaporate from the surface of lakes and oceans. This turns the liquid </span>water<span> into</span>water<span> vapor in the </span>atmosphere<span>. Plants, too, help </span>water<span> get into the </span>atmosphere<span> through a </span>process<span> called transpiration</span>
The second option because solar energy is a renewable source which can be used again.
The third option because walking to work or school would mean that you aren’t using Carbon Dioxide (which is harmful to the environment)
And the 4th option because even though using trains and buses uses Carbon Dioxide, more people can go into one transportation (and it’s public) and they don’t need to use vehicles which is mostly for individuals (mostly only one person driving a car. No passengers)
<span>The role that Stratigraphic dating have played in determining the occurrence of mass extinctions is in its ability to identify different sediment debris. This includes rock and other materials that form or accumulate as the result of natural processes, human activity, or both</span>
