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Dinosaurs represented a major turn in the evolutionary development of organisms on Earth. The first dinosaurs were presu..
This tutorial looks at sex determination via the sex chromosomes, X and Y. Read it to get more info on X and Y chromosom..
Upon fertilization, a zygote forms and develops into an embryo. This tutorial elaborates on the growth and development f..
Some of the body movements can be controlled at will, others cannot. The body has a motor program, which is the pattern ..
Humans are capable of only one mode of reproduction, i.e. sexual reproduction. Haploid sex cells (gametes) are produced ..