Section

María Belén Arriola
14-09-11
Biología: Section Assesment pg. 409
Ms. Abril

1. Describe the environmental condition of early Earth.
Scientist theorize that Earth began as a hot ball ofrock. Meteorites bombarded its surface, and volcanoes formed by the high temperatures inside Earth. Then 3.9 billion years ago, it had cooled enough for water to condensed, and Earth was experiencingviolent rainfalls. The accumulated rainfall formed Earth’s oceans. It is in these oceans, about 3.5 millions years go, that scientist believe the first living organisms appeared.

2. Why are themost fossils found in sedimentary rocks?
Because the slow process of depositing sediments prevented damage to the organism. Fossils are unlikely to be found in other types of rock because of the waysuch rocks are formed.

3. Suggest ways that fossils can provide evidence of the diet of animal species.
*Fossil teeth indicate what kind of food ancient animals ate.
*Fossil bones indicate howancient animals moved (so through this it can be analyze the amount of food they ate).
*The condition, position and location of fossils, help to make deductions about the geography and topographyof past environments (so through this it can be analyze from what place they eat their food).

4. Suppose you are scientific examining layers of sedimentary rock for fossils. In one layer ofrock, you discover the remains of an extinct relative of the polar bear. In layer of rock below this, you discover the fossil of an extinct alligator. What can you determine about changes over time in theclimate of this area.
First, it can be determined that the extinct alligator is older than the extinct relative of the polar bear because the layer is below the other. So the climate of the era ofthis extinct alligator maybe was between hot and tropical. The climate of the era of the extinct relative of the polar bear maybe was a cooler climate with a lot of rainfalls because the layer is...