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14). Snakes share a common ancestor with limbed organisms. Why don’t snakes have limbs?

20). One of the major “road blocks” for organisms in water to move into land, was the ability to develop a way to intake atmospheric oxygen.  

9). Which trait of Tiktaalik helped it to live in water?

8). The presence of _____ allowed Tiktaalik to overcome the force of gravity while on land.

11). The discovery of transitional fossils is important because it supports _____.

7). One of the significant findings with respect to Tiktaalik is that _____.

2). Invertebrates are animals without a _____.

1). A scientist that studies ancient life by means of the fossil record is a _____.

32).  An organism that is trapped in hot lava in a volcanic eruption is more likely to be fossilized than an organism that dies in the middle of a tropical rain forest.

A nurse presents a community education program about mental illness. Which comment by a participant best demonstrates a correct understanding of mental illness from a biological perspective?