Which one of the following is a difference between a normal cell and a cancer cell?
a.
normal cells undergo apoptosis while cancer cells don’t.
b.
normal cells do not respond to regulatory signals while cancer cells do.
c.
normal cells invade surrounding tissues while cancer cells don’t.

Hydrilla (hydrilla verticillata) is an invasive aquatic plant and one of the most serious aquatic pests in florida. hydrilla has already been introduced to hundreds of bodies of water throughout florida, hydrilla is difficult to control because it grows rapidly and survives in many different water depths and conditions. hydrilla • describe how hydrilla affects native plant and animal species. include both a biotic and an abiotic limiting factor. • suggest one biotic and one abiotic recommendation that could slow the spread of hydrilla