Some scientists have hypothesized that the first vertebrates, which were fish, may have evolved from an ancestral tunicate that became sexually mature in the larval form. they suggest that these reproducing larvae were successful and natural selection reinforced the absence of metamorphosis to the adult. which of the following statements does not support the hypothesis that vertebrates evolved from a sexually mature larval tunicate? some living urochordates are free-swimming only as larvae. the vertebral column of adult vertebrates replaces the notochord present in embryonic vertebrates. adult tunicates are sessile and larval tunicates are free-swimming. many invertebrates, all tunicate larvae and adults, and the earliest vertebrates are or were filter feeders.

The scientific method is a series of steps followed by scientific investigators to answer specific questions about the natural world. it involves making observations, formulating a hypothesis, and conducting scientific experiments.the steps of the scientific method are •observation-the first step of the scientific method involves making an observation about something that interests you•question-once you've made your observation, you must formulate a question about what you have observed. •hypothesis-once you've made your observation, you must formulate a question about what you have observed. •experiment-once you've developed a hypothesis, you must design and conduct an experiment that will test it.•results-the results are where you report what happened in the experiment. •conclusion-the final step of the scientific method is developing a conclusion.i hope that this you : )

The direction a chemical reaction occurs is represented by an arrow