The Arctic tundra has wetlands caused by .
A. glaciers that melted thousands of years ago
B. soil that is frozen solid all year
C. summer thaws combined with frozen permafrost
D. the overflow of a large lake each summer

Mention true or false : a) cholera is marked by acute diarrhea and no urination. b)mosquitoes are the source of dysentery germs.

Factors that can increase mutation rates a. high temps b. low temps c. food additives d. uv rays

The is an estimate of the fewest number of organisms a population needs to avoid extinction. this measurement will most if the number of offspring each female in the population produces increases. if the population's this measurement will most likely increase. 1 population density, minimum viable population, carrying capacity 2 decrease, be unaffected, increase 3 death rate increase, dead rate decrease