xplores the various methods of animal reproduction, highlighting the dependency of young animals on their parents, particularly in mammals, birds, and amphibians. It explains both asexual reproduction ...

WASHINGTON D.C., Feb. 28, 2016 -- The development of every animal in the history of the world began with a simple step: the fusion of a spermatozoon (the male gamete) with an oocyte, or egg (the ...

An enigma -- unique to flowering plants -- has been solved by researchers from the UK and South Korea. Scientists already knew that flowering plants require not one, but two sperm cells for successful ...