Why is the absence of bone in Chondrichthyes considered a derived trait?
What will be an ideal response?
All the fishes that lived before the appearance of Chondrichthyes had either bony armor or boney
endoskeleton. Therefore, it is concluded that the trait was lost in the evolution of the lineage.
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Most tunicate adults are
a. herbivores. b. photoautotrophs. c. carnivores. d. scavengers. e. filter feeders
Unlike plants, fungi, and bacteria, animal cells cannot resist volume increases in hypotonic environments. This is
because unlike those other organisms, animal cells ____.
a. do not have central vacuoles b. do not have cell walls c. do not have pumps that can actively pump out excess fluid d. are smaller than those other cells and thus cannot handle large increases in volume e. have relatively more solutes
If the DNA fingerprint of a suspect does NOT match a blood sample from a crime scene, what can you conclude?
A) The DNA in the blood sample probably degraded in a short period of time. B) The suspect was never at the crime scene. C) The blood sample had to come from another person, but the suspect may still have been there. D) The suspect may have been at the crime scene, because DNA fingerprinting has a large error rate.
The exoskeleton of early marine arthropods can be considered a "pre-adaptation" for life on land because it
A) resisted water loss. B) absorbed light. C) protected against predators. D) reflected ultraviolet radiation.