Biosphere ii is a huge dome-covered self-contained structure located outside tucson, arizona. it was built to try to duplicate earth's biosphere and ecosystems in miniature and to use the information gained from the experiment to design similar habitats on the moon and mars. the habitat contained small versions of many of earth's ecosystems, including an ocean with a coral reef, mangrove wetlands, a grassland, a desert, an agricultural system, and a human habitat. eight men and women were sealed inside the habitat for a proposed two-year stay. the air, water, and food for the "biospherians" all came from inside the sealed habitat, and their only contact with the outside was through computers and telephones. before the two years were up, however, the experiment failed. supplemental oxygen was pumped into the facility, and food supplies were provided through the airlocks. what caused the failure of the experiment? it was traced to nutrient pollution. the soil in some of the biosphere ecosystems was unusually rich in nutrients. these excess nutrients caused a huge population explosion in decomposer bacteria, which led to oxygen depletion.

What is the 77 element on the periodtic table

Nhumans, abo blood types refer to glycoproteins in the membranes of red blood cells. there are three alleles for this autosomal gene: ia, ib, and i. the ia allele codes for the a glycoprotein, the ib allele codes for the b glycoprotein, and the i allele doesn't code for any membrane glycoprotein. ia and ib are codominant, and i is recessive to both ia and ib. people with type a blood have the genotypes iaia or iai, people with type b blood are ibib or ibi, people with type ab blood are iaib, and people with type o blood are ii. if a woman with type ab blood marries a man with type o blood, which of the following blood types could their children possibly have? in humans, abo blood types refer to glycoproteins in the membranes of red blood cells. there are three alleles for this autosomal gene: ia, ib, and i. the ia allele codes for the a glycoprotein, the ib allele codes for the b glycoprotein, and the i allele doesn't code for any membrane glycoprotein. ia and ib are codominant, and i is recessive to both ia and ib. people with type a blood have the genotypes iaia or iai, people with type b blood are ibib or ibi, people with type ab blood are iaib, and people with type o blood are ii. if a woman with type ab blood marries a man with type o blood, which of the following blood types could their children possibly have? a, b, ab, and o ab and o a, b, and o a and b

How much time has elapsed from the very beginning of "the memior of the conquistador bernal diaz del castillo" to the end? a. castillo's whole life b. a quarter of an hour c. a few weeks d. a decade