The cardiac muscle is only in the heart because it has special characteristics such as being able to make sustained contractions, coordinated movement, and rapid conduction. Hope this helps!
The soil of Antarctica has little organic content because it is permafrost. This means that the soil is always frozen because of very cold temperatures. Because of this, usually, little-to-no plants or animals can live in it.
Fitness is the quantitative representation of natural and sexual selection within evolutionary biology. It can be defined either with respect to a genotype or to a phenotype in a given environment.
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