Encyclopedia > Unsolved problems in biology

Article Content

Unsolved problems in biology

Unsolved problems in biology include:

Are the conditions necessary for the origin of life narrow or broad?
Why is it necessary for mammals to sleep?

All Wikipedia text is available under the terms of the GNU Free Documentation License

Search Encyclopedia

Search over one million articles, find something about almost anything!

Featured Article

242

... century - 3rd century - 4th century Decades: 190s 200s 210s 220s 230s - 240s - 250s 260s 270s 280s 290s Years: 237 238 239 240 241 - 242 - 243 244 245 246 ...