What problems existed in the gilded age

What have we learned from fossil evidence about evolution? a) it is an abrupt change. b)the process is observable. c) it takes place during one lifetime only. d)the most complex traits are always selected.

Dna is colied into chromosomes in a cell

Ais a landform that is formed at the mouth of a river from the deposition of sediment carried by the river as the water flows.