Flexible shoulder movement is made possible by the presence of which bone? a) the clavicle
b) the skull
c) the jaw
d) the molar

Graphs you see question 5 options: the change in data over time the relationship between different dependent variables the relationship between the independent variable and the dependent variable/s the relationship between different independent variables

What type of appendages do sponges cnidarians roundworms annelids mollusks arthropods echinoderms and vertebrate have? jointed, not jointed, absent  

Can a trait be both polygenic and have multiple alleles? explain why or why not.