Related topics: sperm · fertilizer · offspring · birds · embryos

The growth of an organism rides on a pattern of waves

When an egg cell of almost any sexually reproducing species is fertilized, it sets off a series of waves that ripple across the egg's surface. These waves are produced by billions of activated proteins that surge through ...

Which came first, the lizard or the egg?

In a world first, researchers at the University of Sydney have observed a normally live-bearing Australian lizard lay three eggs and then weeks later, give birth to a live baby from the same pregnancy. This is the first time ...

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