Mastication, or chewing, is a form of mechanical digestion that increases the surface area of foods prior to chemical digestion.
Answer:
- A star’s final stages of life depend on its mass
- Stars die when they run out of fuel
Explanation:
Stars die differently when their core can no longer fuse atoms, depending on their solar masses. The very big stars are able to burn helium into carbon and some able to fuse even carbon. The big stars die to form neutron stars and supernovas. Stars of low solar masses die out by forming white dwarfs.
Disruption of axonal transport would be a good target for his drug.
<h3>What is disruption of axonal transport?</h3>
- Axonal transport defects are among the early molecular events leading to neurodegeneration in mouse models of amyotrophic lateral sclerosis (ALS).
- Gene expression profiles indicate that dynactin-1 mRNA is downregulated in degenerating spinal motor neurons of autopsied patients with sporadic ALS.
- Disruption of axonal transport also underlies the pathogenesis of spinal muscular atrophy and hereditary spastic paraplegias.
- The neurotoxin β,β′-iminodipropionitrile (IDPN) selectively disrupts slow axonal transport without affecting fast anterograde or retrograde axonal transport.
- Impairment of slow axonal transport causes a proximal accumulation of neurofilaments.
- Because neurofilaments regulate axonal diameter, this accumulation leads to a marked swelling of the axon.
- Acrylamide causes decreased axonal transport, also causing proximal accumulations of neurofilaments and swelling.
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The answer is tropical savanna. The region’s ecosystem is characterized by tall grasses,
shrubs, and a scattered distribution of trees (especially acacia trees).
Large regions of tropical savanna extend through the nations of Botswana,
Namibia, and Kenya in Africa. Savannas are also characterized
by seasonal water availability, with the majority of rainfall confined to one
season. They are frequently found in transitional zones between forest and
desert or grassland.
