Fossils are mostly found in ____________ rocks.

The theory that states undisturbed layers of rock have the oldest layers on the bottom and the youngest on the top is known as __________.

• The principle States that the oldest layer is at the base and that the layers progressively younger with ascending order in the sequence.

Which of the following is something that does not provide evidence of fossil record?

• Fossils provide knowledge about history of life on earth.

What is true about radioactive elements?

• Radioactive substance emits free neutrons and a non radioactive substance can become radioactive by catching the neutrons.

The law of superposition states that the younger rock layers lie __________ the older layers of rock.

• Age of layers can be calculated on the basis of position of rocks layers.

Scientists determine the absolute age of fossils by using __________. 

• By using radiometric dating the absolute age of Fossils can be determined.

Which among the following can be determined by going through the fossil record?

• Paleontologists study fossils and make Fossil record to know about the ancient world and history of life on earth.

Who studies fossils?

• Paleontologists study fossils to know about the ancient world and history of life on earth.

Radiometric age is also known as the __________ age.

• Radioactive dating is a technique which is used to date materials.

Collection of fossils that documents the evolutionary history of Earth is known as

• Fossil record documents the 

1. Existence
2. Diversity
3. Extinction
4. Change of many life forms and
5. Changes throughout the history of life on  Earth .

Mutations are important because it leads to:  

Which branch of biology focuses on the study of inheritance?

How many species of finch did Darwin study?

Darwin’s finches show variation in their __________.

Why are variations that are advantageous are more likely to be passed onto offspring?

Which of the following are  ‘problems’ that an organism face?