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1. evolution an increase in the difference among de scendants of a single ancestral species as time passes
3. differences in traits of organisms in a population
5. giant reptiles that ruled the earth during the jurassic period under mesozoic era.
9. is the variety and variability of life on Earth. Is typically a measure of variation at the genetic, species, and ecosystem level.
10. relating to or denoting the era between the Paleozoic and Cenozoic eras, comprising the Triassic, Jurassic, and Cretaceous periods.
11. relating to or denoting the earliest eon of the earth's history, preceding the Cambrian period and the Phanerozoic eon.
16. structures parts of different organisms that are similar in structure but serve different functions
17. species change over time
19. structures structures in different organisms that are similar In function but different in origin
20. this theory of lamarck states that organism change in response to the environment

2. the process by which an organism produces offspring and thus perpetuate the species
4. ability of an or to adjust and thrive in a given environment.
6. the first evolutionist to believe that organisms change over time.
7. meaning "new life", also known as the Age of Mammals, because the extinction of many groups allowed mammals to greatly diversify so that large mammals dominated the Earth.
8. ability to survive and produce offsprings
12. evolution an increase in similarities among species derived from different ancestors as a result of similar adaptation to similar environment
13. remains as once living things including bones, shell, teeth and also faces
14. the era between the Precambrian eon and the Mesozoic era, or the system of rocks deposited during it.
15. a segment of DNA or RNA that codes for protein or RNA, a molecular unit of hereditary trait.
18. an invertibrate, it lived in a shallow marine environment during ordovician and silurian period.