The major structural elements of the cytoskeleton are:. A) The major structural elements of the cytoskeleton are proteoglycans and cellulose microfibrils.
B) microtubules, microfilaments, and intermediate filaments.
C) the extracellular matrix and the cell wall. cleavage furrows and G-actin.
D) the cytoplasm and cytosol.

Which of the following is true about the introduction of a non-native species to an environment? (a) they usually adapt quickly so they can have a positive affect on the environment. (b) they can disrupt the environment and cause much damage and devastation to native species. (c) they usually become predators in a food chain and to keep prey populations under control. (d) because the native species are better-adapted to the environment, the non-native species always end up dying out.