Biogeographical evidence Complete the following paragraph to describe the biogeo
ID: 97304 • Letter: B
Question
Biogeographical evidence
Complete the following paragraph to describe the biogeographical evidence supporting descent from a common ancestor.
marasupials, amphibians, common, reptiles, unrelated, penindula, placental animals, isthmus
Australia and South American were once connected in one large land mass containing recently evolved ____________ . These land masses broke apart.
In South America, an ____________ formed to allow ____________ into the continent.
These ____________ flourished and outcompeted the ____________ .
In Australia, there were few ____________ and therefore little competition, so ____________ flourished and diversified.
To this day, there are few ____________ in South America and many in Australia.
Therefore, ____________ in South America and Australia share a(n) ____________ origin, and the diversification of ____________ in both continents occurred after they were geographically isolated.
Explanation / Answer
Ans.) Australia and South American were once connected in one large land mass containing recently evolved placental animals. These land masses broke apart.
In South America, an isthmus formed to allow marsupial, amphibians into the continent.
These marsupials flourished and out competed the reptiles.
In Australia, there were few placental mammals and therefore little competition, so marsupials flourished and diversified.
To this day, there are few marsupials in South America and many in Australia.
Therefore, marsupials in South America and Australia share a(n) common origin, and the diversification of marsupials in both continents occurred after they were geographically isolated.
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