The phases of human development are biologically defined. how, if at all, can they also be culturally defined?
what is the evolutionary relationship between vitamin d, folate, melanin, and sunshine? how does this affect fitness?

an active site is a region that is present on an enzyme where the reactants or the substrate molecules we can say bind and experience a chemical reaction. the substrate is basically a reactant whose concentration is changing and that is converting into a product after binding at the active site of an enzyme

phylogenetic tree is the tree of life or evolution tree. it shows the different branches of evolution. the sequence goes like tissues - coelom - backbone - endoskeleton - segmentation

i think its y= -4x-14