Across 5: predation
across 6 hominid
down 3 : Distribution
down 9 : glaciations
Answer: Farming
Explanation: Plowing the land is the first source of wealth.
A) the availability of nutrients
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The spinal cord and the brain make up the central nervous system, and spinal cord nerves carry most messages between the brain and the rest of the body.
The vagus nerve carries the signal from the brain to the heart.
The recombinant offsprings are normally the offsprings containing a combination of the parents allele, result in a genotype that differs from both parents genotype. The phenotype May be different as well although it is likely that the phenotype could be the same as the parents, as seen in the case of heterozygous dominant having the same phenotype as homozygous dominant.