Asian carp in the Mississippi River and its tributaries are approaching the Great Lakes and could pose a significant danger to the lakes' ecosystems. Asian carp can weigh up to 100 pounds each and can consume 40% of their body weight in microscopic plant and animal life, which other species, such as crayfish, salmon, trout and bass, also use as a food source. If the introduction of Asian carp into the Great Lakes ecosystem cannot be stopped, what is likely ot happen to the population of crayfish?

A. It is likely to decrease

B. It is likely to increase

C. It is likely to stay the same

D. It is likely to at least double in size

In an ecosystem, energy is transferred from one feeding level to the next. Which statement explains why 90% of the energy is lost during each transfer?

A. It is transferred as thermal energy released from basic metabolic processes before it is transferred to the next feeding level.

B. The energy is locked into the bonds, which cannot be broken by the animal at the next feeding level.

C. The energy is transferred into a unusable form during the consumption process.

D. The energy is returned to the sun once the individual ceases to live.

Julian and Alison set up the following lab experiment. A pipette was filled with grape juice and yeast. Then it was inverted into a test tube filled with warm water. The students observed bubbles being released from the end of the pipette. Which of the following most likely identifies the gas being released?

A. Oxygen

B. Methane

C. Carbon dioxide

D. Nitrogen

diagram link ------------------> http://i51.tinypic.com/r29oif.jpg

An area populated with mature hickories and oaks are going to be cleared to provide room to plant pine trees. Which species of bird will be most negatively affected? Use the information below to answer the question.

A. Cardinal

B. Field Sparrow

C. Summer Tanager

D. Hooded Warbler

diagram link ---------------------------------> http://i56.tinypic.com/bdlc36.jpg