Descending tracts are the pathways by which motor
signals are pass through from the brain to lower motor neurones. Thus, all
the neurones within the descending motor system are classed as upper motor
neurones. The lower motor neurones then directly innervate muscles to produce
movement. Their cell bodies are found in the cerebral cortex or the brain stem,
with their axons remaining within the CNS.
TSH - Thyroid Stimulating Hormone is the hormone that stimulates the Thyroid Gland.
I’m sure the answer is early ancestor.
I believe it has something to deal with helping the zebras adapt to their surroundings.
Darwins observations explain that zebras have stripes to adapt to their surroundings.
Positive feedback loops enhance or amplify changes and this moves a system away from its equilibrium state and make it more unstable.
