Which echinoderm is Horace most likely examining? a sea cucumber because it uses tentacles for feeding
a sea cucumber because it has tube feet
a brittle star because it uses tentacles for feeding
a brittle star because it has tube feet

i think the answer is

mass

you must remain stopped until the stop signal is retracted and the red lights are turned off. approaching traffic in the opposite roadway of a divided highway shall not be required to stop, even if the school bus has the stop-arm extended and the alternately flashing warning signal lamps on.

allowed for the prediction of the properties of missing elements.

in the year 2850, humans successfully colonized mars. the martian modules that were constructed could hold only a small population of people. it is now a century later, and the population on mars has grown to 600 people. of the current mars population, 45 people express the recessive phenotype for phenylketon- uria (pku) syndrome (pp genotype).

explanation: