The upward urban growth is always have negative connotation. upward urban growth degrades the environment because they will create community in areas where animals lives. by disrupting the natural habitat of the of the animal, will lead to decrease in their number.
Explanation:
Survival of the fittest is a phrase that originated from Darwinian evolutionary theory as a way of describing the mechanism of natural selection.In On the Origin of Species, he introduced the phrase in the fifth edition published in 1869, intending it to mean "better designed for an immediate, local environment".
I feel like you're neglecting to add something, but here are the 22 amino acids:
Alanine, arginine, asparagine, aspartic acid, cysteine, glutamic acid, glutamine, glycine, histidine, isoleucine, leucine, lysine, methionine, phenylalanine, proline, serine, threonine, tryptophan, tyrosine, valine, selenocysteine, pyrrolysine
The eight main ones that are essential for us are histidine, isoleucine, leucine, lysine, methionine, phenylalanine, threonine, tryptophan and valine
phospholipids, glycolipids and sterols