What is the name of the mesoderm-derived, calcium-stiffened structures that comprise the internal skeleton of echinoderms?
a. ampullae
b. ossicles
c. madreporites
d. radial canals
Answer: b. ossicles
You might also like to view...
HIV has an RNA genome that is converted to DNA when infecting a human immune cell. This type of virus is called a ________.
A. retrovirus B. bacteriophage C. reverse transcriptase D. prion
Which of the following sequences correctly lists the hierarchical nature of cellular structures, from smallest to largest?
A) organic molecules, supramolecular structures, macromolecules, organelles, cells B) organelles, organic molecules, supramolecular structures, macromolecules, cells C) organic molecules, macromolecules, organelles, supramolecular structures, cells D) organic molecules, macromolecules, supramolecular structures, organelles, cells E) macromolecules, organic molecules, supramolecular structures, organelles, cells
What percentage of the urea filtered by the kidneys is excreted in the urine?
a. 10 percent b. 20 percent c. 50 percent d. 75 percent e. 100 percent
How does making functional form choices put less burden on the data collection process of the analyst?
A. By making functional form choices, an analyst can avoid having to ensure the dataset is structured. B. By making functional form choices, an analyst can avoid having to ensure that the observations are carefully measured. C. By making functional form choices, an analyst can interpolate/extrapolate measures of treatment effects within gaps/beyond the extent of the data sampled. D. By making functional form choices, an analyst can avoid having to take random samples from the population.