The teacher and class were especially saddened when the colonial hydrozoan died. They had watched it carefully, and the unfortunate creature never even got to produce offspring by budding. Yet, everyone was elated when Tommy (now recovered) noticed a small colonial hydrozoan growing in a part of the tank far from the location of the original colony. The teacher was apparently unaware that these hydrozoans exhibit
A) spontaneous generation.
B) abiogenesis.
C) alternation of generations.
D) ecdysis.
E) a medusa stage.
Answer: E
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Biology
- Which era is known as the "age of reptiles"?
- Why is the amniotic egg considered an important evolutionary breakthrough?
- Which of these are amniotes?
- What should be true of fossils of the earliest tetrapods?
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- Arrange these taxonomic terms from most inclusive (most general) to least inclusive (most specific). 1. lobe-fins 2. amphibians 3. gnathostomes 4. osteichthyans 5. tetrapods
- Which of the following belongs to the lobe-fin clade?
- The swim bladder of ray-finned fishes
- There is evidence that ray-finned fishes evolved
- Which group's members have had both lungs and gills during their adult lives?
- Which of these statements accurately describes a similarity between sharks and ray-finned fishes?
- To which of the following are the scales of chondrichthyans most closely related in a structural sense?
- Which of these might have been observed in the common ancestor of chondrichthyans and osteichthyans?
- Jaws first occurred in which extant group of fishes?
- The lamprey species whose larvae live in freshwater streams, but whose adults live most of their lives in seawater, are similar in this respect to certain species of
- A team of researchers has developed a poison that has proven effective against lamprey larvae in freshwater cultures. The poison is ingested and causes paralysis by detaching segmental muscles from the skeletal elements. The team wants to test the poison's effectiveness in streams feeding Lake Michigan, but one critic worries about potential effects on lancelets, which are similar to lampreys in many ways. Why is this concern misplaced?
- The earliest known mineralized structures in vertebrates are associated with which function?
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- What do all craniates have that earlier chordates did not have?
- How many of the following statements about craniates is (are) correct? 1. Craniates are more highly cephalized than are noncraniates. 2. Craniates' genomic evolution includes duplication of clusters of genes that code for transcription factors. 3. The craniate clade is synonymous with the vertebrate clade. 4. Pharyngeal slits that play important roles in gas exchange originated in craniates. 5. The two-chambered heart originated with the early craniates.
- A new species of aquatic chordate is discovered that closely resembles an ancient form. It has the following characteristics: external armor of bony plates, no paired lateral fins, and a suspension-feeding mode of nutrition. In addition to these, it will probably have which of the following characteristics?
- Which extant chordates are postulated to be most like the earliest chordates in appearance?
- Which of the following statements would be least acceptable to most zoologists?
- Chordate pharyngeal slits appear to have functioned first as
If the answers is incorrect or not given, you can answer the above question in the comment box. If the answers is incorrect or not given, you can answer the above question in the comment box.