Fill in the Blank: Write the word that best completes each sentence. 6. is the study of how organisms develop.

7. A change in the allele frequency of a population over time is .

8. The remains of organisms that once lived that provide information about evolution are .

9. was a scientist who collected specimens while on the ship called the Beagle.

10. A(n) sequence can be compared between two different organisms to determine their relationship.

11. A structure that had a function in the past like the wings of an ostrich but do not have a function now are called .

12. The similar structures in different organism like the humerus, ulna, radius, carpals, metacarpals, and phalanges in a bat and human are called .

What’s the Picture: Write the word that is being shown/represented in each picture below.

13. 14.

15. 16.

17.

18. Explain the process of radiometric (radioactive dating) in your own words.