Sentences with phrase «human arrival»

Evolution isn't possible without death long before humans arrival.

He suggests a more conservative estimate of human arrival between 55,000 and 60,000 years ago.

He is convinced that people were responsible for the mass extinctions because they commenced with human arrival everywhere: first, in Australia 60,000 years ago, then mainland America 13,000 years ago, followed by the Caribbean islands 6,000 years ago, and Madagascar 2,000 years ago.

They were likely well adapted to lower and more variable levels of ultraviolet radiation from the sun than the new human arrivals from Africa were accustomed to.

EARLY ARRIVALS These notched sloth bones, perhaps personal ornaments, are evidence of an early human arrival to South America, scientists propose.

In the review, the scientists report analyses of the most comprehensive radiocarbon data set of Caribbean mammals and human arrivals in the Caribbean, representing 57 extinction and extirpation (when a population vanishes from an island) events for native species.

The authors showed that after the initial waves of human arrival, mammal extinctions followed, presumably first caused by hunting and later by forest clearing for agriculture, which reduces the habitat for native mammals.

Previous genetic studies suggested that foxes first appeared on the islands > 16,000 years ago, before human arrival (~ 13,000 cal BP), while archaeological and paleontological data supported a colonization > 7000 cal BP.

These extinctions, in fact, were timed with human arrival, thereby supporting the more widely accepted overhunting hypothesis.

Using genetic material extracted from lemur bones and teeth dating back 550 to 5,600 years, an international team of researchers analyzed DNA from as many as 23 individuals from each of five extinct lemur species that died out after human arrival.

Modern humans and Neanderthals therefore lived in roughly the same regions for thousands of years, but the new human arrivals, from the Neanderthal perspective, might not have been welcome, and for good reason.

«There was a loss of more than 99 % of their population size within 100 years of human arrival.

The pattern of rapid human colonisation through the Americas, coinciding with contrasting temperature trends in each continent, allowed the researchers to disentangle the relative impact of human arrival and climate change.

But prior to human arrival, the whales faced dramatic changes in its feeding grounds due to climate change.

Some of the objectives are repeated in each mission whereas others are unique and revolve around uncovering the planet's history prior to human arrival.