Sharks, skates, rays, and chimaeras comprise the class ____________, and have a skeleton made of tough, elastic
____________. Fill in the blank(s) with the appropriate word(s).
Chondrichthyes; cartilage
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If a material has a half-life of 24 hours, how long do you have to wait until the amount of radioisotope is 1/4 its original amount?
A. 72 hours B. 48 hours C. 12 hours D. 24 hours E. practically forever, but it may be safe by then
Which of the following would NOT help to improve water quality?
A. Stop using fertilizers B. Keeping your car well maintained C. Composting yard waste D. Watering plants with water from rain barrels rather than municipal water. E. Not using jet skis
What are the four models developed by and derived from The Chicago School to illustrate the internal geography of cities?
What will be an ideal response?
The environment in which an organism resides or is biologically adapted to live is called a(n)
A) habitat. B) ecotone. C) trophic level. D) community. E) niche.