species975
cells872
dna812
genes718
gene713
protein693
proteins613
organisms574
fig548
genetic546
evolution542
rna507
bacteria492
biology486
membrane471
molecular463
plants447
acid428
molecules408
evolutionary378
cell376
enzyme372
chromosomes366
amino358
tissue355
enzymes355
atp348
biological333
organism333
chromosome329
humans326
acids317
oxygen315
populations315
carbon306
glucose304
genome304
mammals299
disease297
chemical295
biol292
molecule287
amino acids283
mrna282
que281
growth270
reproductive269
plant262
nucleus258
animals257
entre253
por251
fungi249
para245
tissues243
como239
alleles237
sperm236
allele235
una234
receptor231
selection230
hormone222
receptors222
darwin220
individuals219
meiosis218
sequence210
population208
del206
electron206
mutations204
reproduction199
diversity199
offspring197
que se193
embryo190
eukaryotic189
cycle188
birds184
hormones183
insects181
nutrients181
cellular178
ions175
plasma168
dos168
ser168
amino acid166
cytoplasm166
analysis166
synthesis165
sequences163
este163
environment163
hydrogen161
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