Why did life on Earth develop with two sexes?
1399
Why do only two sexes exist for animals?
25645
Evolutionarily speaking, why do humans have 46 chromosomes
105800
Why only female mammals have well developed mammary glands?
133957
Cell life: division for immortality or reproduction with aging
73931
Why did the original-Earth have continents that resembled the ones on the final-Earth?
108019
Why, specifically, does each generation, on average, improve upon the design of the species rather than degrade it?
98582
Neanderthal/Human Genetics
50545
Why are humans so variable in appearance
30428
Why do we have more male infants born?
101007
Short story from many years ago: the ancient, brilliant, cruel race was Earthlings
48383
How does the modern theory of evolution solve these apparent problems?
96187
Changing the definition of life?
23474
How can the number of genes increase through evolution?
74923
Why did the Earth cool down?
82923
Have we ever observed two drosophila lineages that evolved reproductive isolation in labs?
13675
Human Evolution in Modern Times
106681
Why are female clones more often produced