Like chordates, all invertebrates have
a. tails.
b. eukaryotic cells.
c. backbones.
d. pharyngeal pouches.

Is there any species that went extinct in recent years due to natural causes (not caused by human interaction). if so, what caused it?

Antoine manages a number of apartment buildings that use natural gas for heating, cooking, and laundry. the scatter plot shows the correlation between the outside air temperature and antoine's natural gas bill. which type of correlation does the plot illustrate?

Which structure in the cardiovascular system connect arteries to veins?