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What did the haikouella, a primitive early chordate fossil, lack that vertebrates have?
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Which kind of worm has a closed circulatory system? a planarian b fluke c pinworm d an earthworm
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The two tubes contain bromothymol blue. after 24 hours, what will the color of the water be in tube b? a. green (it won't change) b. yellow c. blue d. colorless (clear)
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Biology, 22.06.2019 10:30
Which of the following is a good definition for the word adaptation? question 1 options: a trait that an organism survive and reproduce in its environment. a change in an organism's environment. the way in which animals obtain food. a temperature change that can cause the extinction of plants and animals.
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What did the haikouella, a primitive early chordate fossil, lack that vertebrates have?...
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