Which of the phyla of animals has the greatest number of species?

A. Arthropoda
B. Chordata
C. Mollusca
D. Annelida
E. Nematoda


A. Arthropoda

Biology & Microbiology

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Echinoderms can be best described as ________.

A. eukaryotic autotrophs that lack tissue, but have bilateral symmetry as larva, and a water vascular system B. eukaryotic heterotrophs with tissue, bilateral symmetry as larva, and a water vascular system C. eukaryotic autotrophs with tissue, bilateral symmetry as larva, and a water vascular system D. eukaryotic heterotrophs with tissue, bilateral symmetry as larva, and a blood vascular system

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Similar to the stomach, the inner layer of the urinary bladder wall has deep folds called ______ that disappear as the bladder fills

Fill in the blank(s) with correct word

Biology & Microbiology

Neurogenetics is ________

A) the study of the protein basis for neurodegenerative disease B) the study of the genetic basis for neurodegenerative disease C) the study of genes associated with the formation of neurons D) the study of genetics that makes human brains unique

Biology & Microbiology

Trichomonas vaginalis 

A. causes vaginitis with a foul-smelling discharge in females. B. causes urethritis in males. C. has four flagella and an undulating membrane. D. does not produce cysts. E. All of the choices are correct.

Biology & Microbiology