Which of the following best describes the concept of competitive exclusion, as demonstrated by the Paramecium experiment?

What is the function of the seminal receptacles?

What is the function of the pyloric ceca? 

The compound eyes of crayfish contain a multitude of individual facets called

Which of the following structures is/are associated with the cephalothorax?  

What is the name of the structure?

In male ascaris nematodes, the large reproductive tube that opens to the genital pore is called the ________________, which connects to a long, convoluted ____________ that ends in a single testis at its narrow tip. 

what is structure A?

What is the name of structure B? 

what is the name of structure F?