The deuterostome group's gene arrangement in the mitochondrial genome of <em>Xenoturbella bocki </em>is remarkably close to that of the chordates and hemichordates and hence to the ancestor deuterostome gene order. Inversion and breakpoint studies particularly point to a similarity to the hemichordates.
Previous morphological investigations imply that Xenoturbella could be classified as a bivalve mollusc, a basal bilaterian, a turbellarian flatworm, a sister group to the echinoderms(nonvertebrate), or a hemichordate. Recent genetic analyses that focus mostly on nuclear genes appear to favour the Ambulacraria (echinoderms + hemichordates). In contrast, a basal deuterostome location is supported by mitochondrial sequences.
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The correct answer is: desertification.
Desertification is a process in which a land which was not a desert before, becomes one. This process can include drying out- through for example loss of water source, such as river diversion- and the loss of vegetation.
The main reason would be evolution. A nocturnal animal has developed over time to see better in the dark, camouflage into the darkness, and it most likely relies on scent more than sight. A diurnal animal would mainly rely on sight and smell almost equally, and have a pelt that can blend in with it's surroundings. The ranges also depend on the animal's habitat, whether its carnivorous, omnivorous, or herbivorous. Carnivores mainly rely on scent, omnivores seem to rely equally, and herbivores most likely rely on scent. Chances are, late humans did have stronger senses, but as we evolved past needing to scent predators and prey, we rely more on sight and only really use scent to recognise certain things. Humans aren't in as much danger as other animals anymore, for the most part.