How did life on the north and south american continents change after the land bridge formed?

Human life did not exist in the Americas until the land bridge between North America and Asia was formed during the Ice Age.

People from East Asia then followed their food source across the land bridge and settled in the Americas.

They eventually adapted and evolved, thus becoming what we know as Native Americans.

Hope this helps:)

Magma forms by partial melting of upper mantle and crust. partial melt means that only a fraction of the available material forms a melt, and that the remainder stays solid. the partial melt rises because of its lower density and ascends through he crust. this is so conclusive mean the answer would be magma igneous rocks or balistic magma.

A,f, g are the points