18.3 And 20.1

Question 1

Speciation

Answer 1

The formation of a new species

Question 2

Reproductive isolation

Answer 2

Separate a species or population so they they no longer interbreed and involve into two separate species.

Question 3

Behavioral isolation

Answer 3

It occurs when two populations that were once able to interbreed, but evolve differences in courtship rituals or other behaviors

Question 4

Geographic isolation

Answer 4

When two populations are separated by two geographic barriers

Question 5

Temporal isolation

Answer 5

It occurs when two or more species reproduce at different times

Question 6

Paleontologist

Answer 6

Researchers who study fossils to learn about ancient life

Question 7

What happens to soft body parts during fossilization

Answer 7

Decay

Question 8

Relative dating

Answer 8

Determine the age of fossils( formation in rock layers)

Question 9

Index fossils

Answer 9

Distinct fossils used to compare relative age of fossils

Question 10

Radiometric dating

Answer 10

Method for determining age of sample from the amount of radioactive isotope to the amount of non radioactive isotope of the same element in the sample

Question 11

What is more specific

Answer 11

Radiometric

Question 12

Geologic time clock

Answer 12

24 hour period that condenses all of earths history(humans are 60 seconds

Question 13

Biogeography

Answer 13

How organisms have been distributed over time