Which organism forms the primary source of food for a deep-sea community at a hydrothermal vent?
a.
phytoplankton
b.
zooplankton
c.
all pelagic organisms
d.
giant tube worms
e.
chemosynthetic bacteria

What is one affect on the australian environment due to the introduction of non-native european rabbits? (a) more grass grew in response to the need of the growing population of rabbits. (b) the rabbits balance out the food chain as they became a natural prey to many predators. (c) the rabbits the land by digging, which caused the soil to spread much needed nutrients. (d) the rabbits out-competed other small animals species and caused them to go extinct.