1) Scientists believe that the ancient ancestors of all animals were <span>single-celled eukaryotes that sometimes grew in colonies.
</span>Eukaryotic cells have membrane-bound organelles such asmitochondria<span> and the Golgi apparatus.
</span>The best answer is :
<span>B) single-celled eukaryotes that sometimes grew in colonies</span>
It is a genus (which is greater than a species but lower than a family) of extinct lamp shells, called brachiopods.
The cochlea is responsible for sound transduction.
I thinking like its 2,4,5
D - Allow pH to change drastically.
The reason that we have buffer in our system is to protect AGAINST sudden change of pH
