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Which of the following phyla has organisms with a closed circulatory system?

What feature distinguishes flatworms’ nervous systems from Cnidaria?

The film describes the discovery of one of the earliest legumes in the fossil record. According to the film, what did legumes provide that was so significant to some early mammals?

In this phylogenetic tree, what trait is shared by Arthropoda and Nematoda? 

Which process helps move food through the digestive tract via muscle contractions?

In a closed circulatory system, blood:

Which of the following is not a characteristic of amphibians?

Spiders and scorpions belong to the phylum:

A court is evaluating the constitutionality of a law in a Substantive Due Process case. To determine the constitutionality of the law, the court is determining whether that law is necessary for the accomplishment of a compelling state interest. Based on how the court is evaluating the law, which of the following is most likely to be true?

Which of the following best describes the requirements for a warrant to be valid under the Fourth Amendment?