12) Why is the natural greenhouse effect of Earth a cause for concern now?
t
3
A)
Greenhouse gases act as natural insulators and prevent the heat
of the Sun from reaching Earth.
B)
Greenhouse gases destroy the ozone layer, which acts as natural
insulation against ultraviolet radiation from the Sun.
The rise in the amount of greenhouse gases has resulted in
global warming, because more heat gets trapped in the
atmosphere.
C)
D)
The rise in the amount of greenhouse gases has reduced the
amount of oxygen in the air, decreasing the breathable air on
Earth.

1. true.2. true.3. true.4. false.5. true.the concept of darwin's theory of evolution involves the idea that there are limited resources in a given living environment and that the organisms which live within have variations in their genetic make up due to random mating. the ones with beneficial genetic variations can express certain traits which give them an upper hand in surviving and reproducing in the said environment compared to ones who may have a more disadvantageous variation in traits. over time, the organisms with an upper hand will survive and reproduce more frequently and pass on their beneficial genes while the others die. the result is evolution, where we observe (usually, but not always) eventually, phenotypic distinct changes.