<span>Our biosphere is the global sum of all ecosystems. It can also be called the zone of life on Earth, a closed (apart from solar and cosmic radiation) and self-regulating system. Geology studies the Earth, and has tendrils in all ecosystems, thus the connection to the biosphere.</span>
Together, the CNS and PNS transmit messages throughout your body that instruct you to do essential functions, such as breath, move, see, smell, and think. The nervous system performs these additional functions:
Controlling heart rate
Releasing hormones
Regulating digestion
Protecting neurons and neurotransmitters
Influencing behavior and emotions
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Answer:
The major evolutionary changes was overtime Pakicetus had an earbone with a feature unique to whales and an ankle bone that linked it to artiodactyls.
Answer :Four characteristics were to be used for the classification of all viruses:
Nature of the nucleic acid in the virion.
Symmetry of the protein shell.
Presence or absence of a lipid membrane.
Dimensions of the virion and capsid.
Explanation: