Which species was NOT present in Coyote Valley according to the De Anza student's monitoring?

a polymer is a chainlike molecule made up of small molecular units. these small molecular units are called monomers. monomers of polymer can be joined together either naturally or synthetically.  

he forelimbs below belong to four species that descended in a direct line from the ancestral mammal shown above. of the four descendants shown, which species most likely appeared earliest in evolutionary history?

sound moves fastest in solids because the molecules are tightly packed and it allows sound to vibrate