The first one is natural, second is oil, this one is oil, fourth one is natural and the last one is coal.
A cell is the building block of an organism, or the smallest unit of life. The creatures inside provide food and energy to us, because we can't make our own energy.
An alternation of generations for plants include a haploid gametophyte and a diploid sporophyte.
The DNA tells a ribosome how to assemble a protein.