Upon close examination of the skeleton of an adult python (a type of snake), a pelvic girdle (hip bones) and leg bones can be observed. These features are an example of... Question 6 options: artificial selection comparative biochemistry vestigial structures comparative embryology

the "dirty dozen" chemicals banned in an international treaty are formally known as persistent organic pollutants, or pops. the united nations environment program provided this background on what they are and what they can do to humans and wildlife.

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on island x the species needed to adapt because they were being subject to predators which didn't inhabit island y.  

the law of original horizontality explains:   why rocks appear in layers. correct answer: b the law suggests that all rock layers are originally laid down (deposited) horizontally and can later be deformed.   the principle is used by geologists to make assumptions about the relative ages of sedimentary rocks.