5 The diagram below represents the nitrogen cycle in a student's aquarium. Ammonia, nitrites, and, W
nitrates can be harmful to fish. The student wants to keep the nitrogen in this aquarium cycling normally without having
to continually change the water.
CO, A
Carbon dioxide
Carbon dioxide (CO2)
and ammonia (NH)
Ammonia
Fish
and food
Nitrates
(NO3)
Nitrites
(NO)
Removed by
plants and water
changes
Nitrobacter
(bacteria)
OO
Nitrosomonas
(bacteria)
Which of the following should the student add more of to help remove nitrates and improve the natural cycling of
nitrogen in this aquarium?

What do we call an individual that has inherited two identical alleles for the same trait? a. homozygous b. heterozygous c. monozzygous

What evidence could be used to convince policy makers to change a shipping lane from going through a whale breeding ground? information on the number of all whale species currently alive information on the number of all whales hit by boats in the given area information on the number of whale deaths in the world's oceans information on the number of whale offspring born every year. (a) scientists could collect and combine data on fish populations all around the world to show that their populations are declining. (b) scientists collect and combine data on fish populations all around the world to show that their populations are increasing. (c) scientists work together and use past data to show that fish populations are becoming locally extinct in some areas. (d) scientists work together and use past data to show that some fish populations are adapting to environmental changes.

The genetic code is essentially the same for all organisms. based on this information, one can logically assume which of the following statements to be correct? a. dna was the first genetic material. b. the same codons in different organisms translate into the different amino acids. c. different organisms have different numbers of different types of amino acids. d. a gene from an organism can theoretically be expressed by any other organism. e. all organisms have experienced convergent evolution.