Lichens and algae I believe
A.
conserve energy
The smaller muscle mass of the sloth, means that it needs less energy to work, allowing it to be able to survive on a less diet.
Most of their muscles are concentrated in their upper body, allowing them to be efficient climbers but very slow on the ground.
Different forms of a given gene are known as "alleles". Alleles are essential for the formation of life and add to diversity both within and outside the organism itself in many ways.
<em>An organism's genetic code is determined by the sequence of nucleotides of the DNA. </em>
What I mean is that it determines the nitrogen bases along a gene.
