Natural Selection

3. the basic unit of classification and a taxonomic rank of an organism
6. the action or process of adapting or being adapted
7. the alteration of the nucleotide sequence of the genome of an organism
10. types of rock that are formed by the accumulation or deposition of small particles and subsequent cementation of mineral or organic particles
11. means the ability to survive to reproductive age
13. is all the organisms of the same group or species
15. the difference in DNA among individuals

1. a fossil of a footprint, trail, burrow, or other trace of an animal rather than of the animal itself
2. was an English naturalist, geologist and biologist, best known for his contributions to the science of evolution
4. is the change in the characteristics of a species over several generations
5. best known for his Theory of Inheritance of Acquired Characteristics
8. that each generation has more offspring than can be supported by the environment
9. the process whereby organisms better adapted to their environment tend to survive and produce
12. he state or process of a species, family, or larger group is all dead
14. Any preserved evidence of life from a past geological age