Select one of the following habitats and set up a living community. You may use an area nearby to gather organisms or environmental factors for your habitat.
• freshwater aquarium
• woodland terrarium
marine aquarium
• desert terrarium
aqua-terrarium
.
Then, respond to the following questions and prompts in the essay box below using at least 300 words.
1. Indicate the habitat you chose.
2. What kinds of organisms does your habitat contain?
3. Describe at least three environmental factors essential to the survival of organisms in your habitat.
4. Study your habitat for several weeks to observe and record any changes. What changes occurred in your habitat
after a period of time?
5. What effect will these changes have on your habitat?

the diploid number of chromosomes is sometimes represented by the symbol 2n. for the fruit fly, the diploid number is 8, which can be written as 2n = 8, where n represents twice the number of chromosomes in a sperm or egg cell.

this age may represent the age of the earth's accretion, of core formation, or of the material from which the earth formed. this dating is based on evidence from radiometric age-dating of meteorite material and is consistent with the radiometric ages of the oldest-known terrestrial and lunar samples.

in a chemical reaction, the atoms and molecules produced by the reaction are called products. no new atoms are created, and no atoms are destroyed. in a chemical reaction, reactants contact each other, bonds between atoms in the reactants are broken, and atoms rearrange and form new bonds to make the products.