Answer:
Because of the fact that Snails cannot survive in nasty water.
Explanation:
The amino acid sequence in protein from the gene fragment for botana curus
is the same with species Z that is valine, histidine, leucine, threonine, proline,
glutamine and glutamine. Meanwhile, species X and species Y has different amino
acid sequence compared to botana curus. Therefore, species Z is most closely
related to botana curus because both species has the same amino acid sequence
and has similar sized DNA fragments.
The slow twitch muscle fibres have a higher count of mitochondria which means it can process quicker, it receives a energy, it receives a good blood supply since it has a high amount of capillaries, which means it has a good supply of oxygen, which helps to maintain the use of the aerobic energy system for longer, making type 1 fibres more effect for endurance, while the type 2 fast twitch have less mitochondria and rely more on glycolysis.
