Physics & Astronomy
biosphere
100%
organisms
56%
proteins
50%
characterization
34%
meteorite collisions
19%
temperature
18%
geological surveys
18%
ribonucleic acids
16%
fossils
14%
Earth surface
13%
amino acids
12%
surface temperature
10%
ambient temperature
10%
histories
8%
estimates
6%
Earth & Environmental Sciences
biosphere
63%
protein
45%
organism
35%
temperature
23%
early Earth
13%
ancestry
11%
RNA
10%
meteorite
10%
fossil record
10%
geological survey
10%
Archean
9%
amino acid
9%
phylogenetics
8%
surface temperature
8%
environmental conditions
8%
timescale
7%
public
7%
history
5%
analysis
2%
Agriculture & Biology
biosphere
75%
organisms
36%
temperature
25%
proteins
21%
amino acid sequences
18%
surface temperature
14%
fossils
13%
ancestry
10%
history
9%
ambient temperature
9%
environmental factors
8%
amino acids
7%
phylogeny
7%
Medicine & Life Sciences
Temperature
45%
Proteins
23%
Meteoroids
19%
Ribosomal RNA
13%
Computer Simulation
9%
History
7%
Amino Acids
7%
Databases
6%
In Vitro Techniques
4%
Chemical Compounds
Protein
26%
Ribosomal RNA
14%
Surface Temperature
13%
Environment
11%
Time
3%
Acid
3%