Answer: 31 pairs of spinal nerves
Explanation:
In the nervous system, bundles of fibres are called nerves.
The spinal nerve carries motor, sensory, and autonomic signals/information from the spinal cord to the brain and other part of the body.
The human body spinal cord consists of 4 regions, and 31 pairs of spinal nerves. The 31 pairs of spinal nerve are distributed one on each side of the vertebral column within the four regions of the spinal cord. The four regions of the spine are the cervical, thoracic, lumbar and sacral regions.
Answer is 31 pairs.
Provides protection and support
Explanation:
Modern methods indicate that the mutation rate is roughly one to two mutation per 10,000 genes per generation.
<h2>The given statement is true</h2>
Explanation:
The recent finding of the fossils which showed that <em>Homo erectus</em> and <em>Homo habilis</em> lived side by side in eastern Africa for perhaps half a million years challenged the conventional way that these two species evolved one after the other(<em>H.habilis</em> 1.44 million years old and <em>H.erectus </em>1.55 million years old)
- The fossils were found in Kenya and took years to prepare the specimens for study and to be sure of the identification of the species, the scientists said
- University of Utah geologists determined the dates of the fossils from volcanic ash deposits
- The most recent <em>Homo habilis</em> that had been known was about the same age as the earliest <em>Homo erectus</em><em>,</em> said Daniel Lieberman, a professor of biological anthropology at Harvard University, “Now we have extended the duration of the habilis species, and there’s no doubt that it overlaps considerably with erectus”
- The fact that the two hominid species lived together in the same lake basin for so long and remained separate species, Meave Leakey said in a statement from Nairobi, “suggests that they had their own ecological niche, thus avoiding direct competition”
