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When a plant stem is placed horizontally, which side experiences a higher concentration of auxin?

Which of the following statements regarding gonopods is true? 

What is structure B in the circulatory system?

The lateral lines in Ascaris lumbricoides contain what internal organs? 

What statement applies to the population densities of the two species when grown alone? 

Which of the following structures are found within the ambulacral groove? 

Arthropods demonstrate which of the following characteristics?

What type of digestive tract is present in roundworms?  

Which of the following is a function of the pereopods? 

the nephridia are involved in which of the following physiological processes?