3. Use the list below to write the correct term for each definition below.

adaptation
extinct
gene
Darwin
fittest
mutation
evolution
fossils
natural selection

a. A change in genes that causes a change in a particular trait
b. Describes a species that no longer has any living representatives

c. A trait that a species develops over generations which helps it to survive

d. a unit of DNA that
determines a specific trait in the organism

e. The survival of organisms best fit for the environment

f. Changes in living things over time

g. Remains of organisms that lived in the past

h. Best suited to survive in its environment

L. The biologist who developed and offered evidence of the theory of Natural selection

The troposphere gets warmer as altitude increases.

Proteins are the workhorses of the cell, controlling virtually every reaction within as well as providing structure and serving as signals to other cells. proteins are long chains of  amino acids  , and the exact sequence of the amino acids determines the final structure and function of the protein. instructions for that sequence are encoded in  genes  . to make a particular protein, a messenger ribonucleic acid (mrna) copy is made from the gene (in the process called  transcription  ), and the mrna is transported to the  ribosome  . protein synthesis, also called  translation  , begins when the two ribosomal subunits link onto the mrna. this step, called initiation, is followed by elongation, in which successive amino acids are added to the growing chain, brought in by transfer rnas (trnas). in this step, the ribosome reads the  nucleotides  of mrna three by three, in units called  codons  , and matches each to three nucleotides on the trna, called the anticodon. finally, during termination, the ribosome unbinds from the mrna, and the  amino acid  chain goes on to be processed and folded to make the final, functional protein