Why do we think that the forest communities of eastern North America havechanged dramatically over the past 18,000 years, as evidenced in the image below?a cor-ettlersreachgigan-S andlands-I westIS WEmanytoday.e andexceps extentCORDILLERAN ICE SHEETMark only one oval.77Lake TabeeLAURENTIDE ICE SHEET<}}广州North of that line thecimate was more thun12°C colder comparedto pre-industrial temperatures fore ng earlysettlers to move souchbigger as gacersAs the glrock andlarge fand cenonWhen thebehind aknown asthe mideOA) Glacial retreat exposed land for primary succession that long ago.B) Large fires exposed land for secondary succession that long ago.C) Successional changes are typically very rapid and all communities change at thisspeed.OD) Pollen evolved at this time.

Ecological succession is the process by which an ecological community changes and develops over time…

Why do we think that the forest communities of eastern North America have changed dramatically over the past 18,000 years, as evidenced in the image below? a cor- ettlers Freach gan- 5 and lands- 1. West SWE many today. e and excep s extent CORDILLERAN ICE SHEET Mark only one oval. FECAMAS Lake Tance LAURENTIDE ICE SHEET North of that line the climate was more thun 12C colder compared to pre-industrial tem peratures, fate ng early sectlers to move souch D) Pollen evolved at this time. bigger as glaciers As the gl rock and large enf and cenon When the behind a known as the mide today ag A) Glacial retreat exposed land for primary succession that long ago. B) Large fires exposed land for secondary succession that long ago. C) Successional changes are typically very rapid and all communities change at this speed.

Why do we think that the forest communities of eastern North America have changed dramatically over the past 18,000 years, as evidenced in the image below? a cor- ettlers Freach gan- 5 and lands- 1. West SWE many today. e and excep s extent CORDILLERAN ICE SHEET Mark only one oval. FECAMAS Lake Tance LAURENTIDE ICE SHEET North of that line the climate was more thun 12C colder compared to pre-industrial tem peratures, fate ng early sectlers to move souch D) Pollen evolved at this time. bigger as glaciers As the gl rock and large enf and cenon When the behind a known as the mide today ag A) Glacial retreat exposed land for primary succession that long ago. B) Large fires exposed land for secondary succession that long ago. C) Successional changes are typically very rapid and all communities change at this speed.

Biology: The Unity and Diversity of Life (MindTap Course List)

15th Edition

ISBN:9781337408332

Author:Cecie Starr, Ralph Taggart, Christine Evers, Lisa Starr

Publisher:Cecie Starr, Ralph Taggart, Christine Evers, Lisa Starr

Chapter46: Ecosystems

Section: Chapter Questions

Problem 1DAA: Changes in the Air To assess the impact of human activity on the carbon dioxide level in Earths...

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Changes in the Air To assess the impact of human activity on the carbon dioxide level in Earths atmosphere, it helps to take a long view. One useful data set comes from deep core samples of Antarctic ice. The oldest ice core that has been fully analyzed dates back a bit more than 400,000 years. Air bubbles trapped in the ice provide information about the gas content in Earths atmosphere at the time the ice formed. Combining ice core data with more recent direct measurements of atmospheric carbon dioxideas in FIGURE 46.13can help scientists put current changes in the atmospheric carbon dioxide into historical perspective. FIGURE 46.13 Changes in atmospheric carbon dioxide levels (in parts per million). Direct measurements began in 1980. Earlier data are based on ice cores. What was the highest carbon dioxide level between 400,000 B.C. and 0 A.D.?
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