Carbohydrates are the main source because of the presence of cAMP in cells
This clouds are commonly called as a solar nebula. This is
where some of the planets, like our planet Earth are formed. This clouds, are
made of intergalactic space that is filled with clouds of gas (Helium and
Hydrogen) and dust which to be known as molecular clouds.
I think it might be B.) and C.)
Out of the chooses given, the best description between evolution and natural selection is that natural selection leads to evolution. The correct answer is A.
A plant is the source of oxygen released into the air as a product of photosynthesis. Try to remember this
Plants Give Us Oxygen,
We Give Plants Carbon Dioxide.