Ahuman female has a special pair of chromosomes that are represented by the letters a) xx. b) xy. c) yy. eliminate d) xz.

Acladogram is a branching diagram that represents suggested evolutionary relationships among organisms based on the presence of unique traits. a scientist discovers a new organism that lacks limbs and does not have a true backbone. the organism lays eggs to produce offspring and has a cartilage-like rod known as a notochord running along its dorsal surface. on the cladogram below, select the species to which the newly discovered organism is most closely related.

What is a codon and where is it found

In what for do plants utilize nitrogen? why do they need nitrogen?