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Biology

what prevents the lac genes in the DNA of E. colin from being expressed most of the time ?

Iron attaches oxygen to what in our bodies? A. muscles B. teeth and bone C. red blood cells

Explain why the presence of a pelvis is not an important adaptation to life in the ocean

In 2015, a large group of female walruses and their calves convened on a single beach in Alaska. Traditionally, walruses utilized sea ice as a resting and nursing ground for their young. However, due to anthropogenic activities and global warming, significant portions of the sea ice have melted. This situation could have several consequences for the walruses and their ecosystem over time. Firstly, the overcrowding on beaches can lead to increased mortality rates among calves due to stampedes when the walruses are startled. This could potentially result in a decline in the walrus population. Secondly, without sea ice, walruses are forced to swim longer distances to find food, which can be particularly strenuous for the young, possibly leading to starvation and reduced survival rates. Thirdly, the benthic habitats—the sea floor ecosystems—could be adversely affected due to the increased pressure from more walruses foraging in a concentrated area. This could lead to the depletion of food resources, affecting not only the walruses but also other species that rely on the same food sources. Lastly, there could be broader ecological impacts as the balance between predators and prey shifts. Other arctic animals that depend on sea ice for their life cycles may also be forced to alter their behaviors, potentially disrupting the entire marine food web.

Blood enters the pulmonary vein with close to ____________ of the binding sites for oxygen saturated.

Early investigators thought the oxygen produced by photosynthetic plants came from carbon dioxide. in fact, it comes from _____.

What process produces the 2N sporophyte in the moss life cycle

The chemical that neutralizes the acidic chyme so that the lining of the small intestine is not eroded is _____.

which nitrogenous base is part of an RNA molecule but not a DNA molecule?

1. Please provide an example of a food chain that includes fungi. 2. How do snails recycle nutrients in an ecosystem?

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