In a laboratory, a scientist gathered identical E. coli cells and grew them in separate petri dishes labeled as population A, population B, and population C. With plenty of food and the right temperature, all E. coli cells in each population increased by reproducing every 20 minutes. However, populations A, B, and C were introduced to antibiotic 1 (Penicillin) and antibiotic 2 (amoxicillin). After one hour, the scientist observed each population under the microscope and noticed that population A died after receiving both antibiotics, population B survived but was not able to reproduce again, and population C survived and reproduced more abundantly by overtaking population A and B in the next generation. What mechanisms would BEST explain how population C developed an antibiotic resistance or acquired adaptations or features that made it well-suited to its immediate environment?

A
Natural selection and Mutation
B
Natural selection and Hybridization
C
Polyploid and Recombination
D
Polyploid and Migration

the actual answer was 160934

hypoxemia refers to a below usual concentration of oxygen in the blood, mainly in the arteries. hypoxemia is an indication of an issue associated with circulation or breathing and may lead to various symptoms like shortness of breath.  

the condition is identified by determining the level of oxygen in the blood sample obtained from an artery. it can also be predicted by determining the oxygen saturation of the blood with the application of a pulse oximeter.  

the normal arterial oxygen is about 75 to 100 mm hg. the values underneath 60 mm hg is generally considered with the requirement for supplemental oxygen. the normal pulse oximeter readings generally range between 95 to 100 percent. the values under 90 percent are regarded as low.  

in the given case, the oxygen saturation is measured at 93 percent, hence, there is no need to administer oxygen, that is, one should withhold oxygen.  

answer and explanation;

volcanic rocks are igneous rocks which form from lava, molten rock which has been thrust out of a volcano onto the surface of a rocky body such as an asteroid, planet, or dwarf planet.  

plutonic rocks are igneous rocks which form from subterranean chambers of molten rock or magma. plutonic rocks make up the base of continental crust as well as oceanic crust. their slow rate of formation causes them to be coarse grained since there is plenty of time for large crystals to form before the magma solidifies into rock.

the textural difference is that plutonic rocks are more coarse grained than volcanic rocks. plutonic rocks are coarse grained while volcanic are fine grained ; glassey or fragmental. since fine and coarse are adjectives the decision as to whether a rock is fine or coarse grained is generally made on the bases of whether or not the individual crystals can be seen in most if the rock.