1. A student wanted to determine the relationship between two types of sea star, Pisaster and Leptasterias. She set up a large aquarium that closely resembled the natural habitat of the sea stars and added several individuals of each type. She recorded the weight of each Leptasterias sea star over 2 weeks. She then added more Pisaster sea stars to the aquarium and recorded the weight of the Leptasterias sea stars over 2 more weeks. Next she removed all the Pisaster sea stars from the aquarium and recorded the weight of the Leptasterias sea stars over the final 2 weeks. The results of the experiment are shown on this graph.

Which of these is the best conclusion about the relationship between Pisaster and Leptasterias based on the student's experiment?

O   a. Pisaster is a predator of Leptasterias
O   b. Leptasterias is a parasite of Pisaster
O   c. Leptasterias is not affected by the presence of Pisaster
O   d. Pisaster and Leptasterias compete for the same resources.

2. This diagram shows an energy pyramid for an ecosystem. The producers in the ecosystem produce 25,000,000 kilocalories per year. How much energy is most likely available to the organisms in Level 2 of the pyramid?

O   a. 250,000 kilocalories per year
O   b. 2,500,000 kilocalories per year
O   c. 25,000,000 kilocalories per year
O   d. 250,000,000 kilocalories per year

3. This table shows the presence of cell structures in an organism. According to the table, how should this organism be classified?

O   a. bacteria
O   b. plant
O   c. animal
O   d. virus

4. This diagram shows a segment of a gene before and after a process. Which of these is a result of the process in the diagram?

O   a. an identical DNA sequence that will code for an identical protein
O   b. a shorter RNA sequence that will code for a shorter protein
O   c. a substituted base in the DNA molecule that could change the structure of a protein
O   d. an added base in the RNA molecule that could change the structure of a protein

5. A certain disease in humans is a recessive trait (n) while the normal condition is dominant (N). This Punnett square shows the genotypes for a couple that wants to have a child. What is the probability that the couple's child will inherit the disease?

O   a. 0%
O   b. 25%
O   c. 50%
O   d. 100%

6. This diagram shows the movement of matter from the soil to mountain lions in an ecosystem. What type of organism is primarily responsible for recycling matter from mountain lions' bodies back to the soil?

O   a. herbivores
O   b. omnivores
O   c. producers
O   d. decomposers

7. Robert is studying the mating behavior of hanging flies. Female hanging flies typically require their male mates to bring them a gift, such as a moth, to eat. Robert raised a group of female and male hanging fly larvae in isolation from adult hanging flies. When these larvae became adults, the females also required a gift from their mates.

Which of these is the best explanation for this behavior?

O   a. The behavior is acquired randomly.
O   b. The behavior is learned through imprinting.
O   c. The behavior is learned through experience.
O   d. The behavior is inherited through genes.