2. The vertebrae in the backbone (a) are muscles. (b) protect the spinal cord. (c) are part of the circulatory system.

Influenza viruses are classified into three types. List the three types and give a description of each.

What is an invasive species? \[ \begin{array}{l}\text { a. A species that reproduces very slowly } \\ \text { b. A species that only eats plants } \\ \text { c. A species native to a particular ecosystem } \\ \text { d. A species that is not native to a particular } \\ \text { ecosystem and can harm the environment }\end{array} \]

39-Les passages respiratoires accomplissent toutes ses fonctions sauf a-Purification d'air. B-Humidification d'air.

\begin{tabular}{l} Invasive species can be controlled by removing them \\ physically or introducing \\ \begin{tabular}{l|l|}\hline \( 5 / 5 \) & autotrophs \\ < Prey \\ prey \end{tabular} \\ \( \begin{array}{l}\text { predators }\end{array} \) \\ \hline\end{tabular}

a. population b. individual c. ecosystem