1. what biome is characterized by very low temperatures, little precipitation, and permafrost? a. desert b. temperate forest c. tundra d. tropical rain forest 2. which two biomes have the least precipitation? a. tropical rain forest and temperate grassland b. savana and tropical rain forest c. tundra and desert d. boreal forest and temperature forest 3. which of the following would not be a factor that determine the characteristics of a land biomes have altering warm and cold seasons? a. exposure to solar flares b. relative humidity c. latitude d. prevailing winds 4. what factor explains why tundra biomes remain cold year-round but taiga biomes have altering warm? a. vegetation cover b. average precipitation c. altitude d. latitude 5. what factors explain the difference in biodiversity between the tundra and the tropical rain forest? a. the large land area occupied by rain forests provides more space for a large variety of organisms to live b. warmer temperatures and higher average rain fall in the tropical rain forest allow more living things to survive c. unlike tropical rain forests, tundra biomes are cut off from oceans by ice, and so they lose access to a rich source of food d. the tropical rain forest is not as supportive of predators as the tundra, which allows many more organisms of varying types to flourish

The answers:

1. C. Tundra

2. C. Tundra & Desert

3. A. Exposure to solar flares

4. D. Latitude

5. B. Warmer temperatures and higher average rainfall in the tropical rain forest allow more living things to survive

"1. it should be, it has been for about 20 years, and it's really not much different in the end than breeding animals to have particular traits. there are always concerns about genetically engineered animals/plants affecting the environment in unexpected negative ways, but i can't think of an example where the fears didn't turn out to be baseless.  

first, as you point out, it would be a great advance in pharmacology, to be able to tailor drugs and their doses to me. the pros involve better medical treatment. the cons involve privacy issues like insurance companies denying coverage to people with genetic risk factors. looking at dna markers wouldn't affect the frequency of genetic diseases, but it would allow detection of them earlier. and ok, actually i suppose that if people used this information to avoid having children with genetic diseases, some might decrease in frequency."

the menstrual cycle – higher tier. negative feedback mechanisms affect the production of hormones in the menstrual cycle. oestrogen also stimulates the release of lh (luteinising hormone) from the pituitary gland, which in turn controls the production of progesterone.