One primary factor in shaping the polarity of the body axes in chick embryos is C. gravity.
The early developmental stages for organisms are a complex procedure and each kind of organism has its own kind of developmental phase. In mammals, the size of an egg is particularly small, hence the study becomes more difficult.
Gravity acts as a critical factor for determining the body axis at the time of embryogenesis. The dorsal-ventral axis for chick embryos is fixated due to gravity.
The bilateral symmetry of a chick depends on gravity. Research has shown that intrauterine rotation is only a tiny factor in shaping the bilateral symmetry of a chick embryo. It is the gravity that mostly affects the bilateral symmetry.
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Genetic drift happens when well-adapted organisms survive and reproduce more often than poorly-adapted organisms. <span>The statement that best sums up evolution is the change in a population through genetic variation over time. Natural selection may be through (1) differential reproduction, that is, not all organisms are able to reproduce to their fullest capacity because nature cannot simply sustain it and (2) acquire genes, that is heredity.</span>