The given statement is false, as Paleolithic people thrived in the groups of 20 to 30 individuals.
At the time of Paleolithic, the hominins gathered together in brief societies, like bands, and survived by fishing and gathering plants, scavenging or hunting wild animals. The Paleolithic era is featured by the application of knapped stone tools, however, tools made up of woods and bones were also used by humans at that time.
B because the temperature goes up then the birds would move to the south were it is cooler.
Answer - It is a Great Concern because microbes such as a hydra can consume some of that mercury which then a shrimp can consume that microbes which then transfer into the mouth of a trout which then when humans fish they consume the fish which later we get Mercury poisoning.
Reasoning - There are more concern but these are a few and some reasoning.
Dna replication so it replicates your DNA to occur