In one liter of blood, more than 98% of oxygen gas is transported by red blood cells or erythrocytes and the remaining 2% of this gas is dissolved in plasma. As for carbon dioxide,
70% of this gas is transported by the elements of plasma and the remaining 30% is
transported by red blood cells.
Hemoglobin, the main constituent of red blood cells, has the property of combining
rapidly and in a reversible manner with O2 gas or CO2
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1. Pick out, by referring to the text :
a. The property that makes hemoglobin the essential transporter of Oz gas.
b- The constituent of blood where hemoglobin is present.
2- Indicate the constituents of blood that ensure essentially the transport of carbon dioxide. Justify
the answer
3- Write the chemical reaction corresponding to the combination of hemoglobin with oxygen gas.

The term used to describe a disease-causing microorganism isa. virus.b. infection.c. pathogen.d. microbe.e. bacterium.

To answer this question, researchers studied populations of the dusky salamander (desmognathus ochrophaeus) living on different mountain ranges in the southern appalachian mountains. the researchers tested the reproductive isolation of pairs of salamander populations by leaving one male and one female together and later checking the females for the presence of sperm. four mating combinations were tested for each pair of populations (a and b)—two within the same population (female a with male a and female b with male b) and two between populations (female a with male b and female b with male a). the proportion of successful matings for each mating combination was measured. for example, when all the matings of a particular combination were successful, the researchers gave it a value of 1; when none of the matings were successful, they gave it a value of 0. then the researchers calculated an index of reproductive isolation that ranged from 0 (no isolation) to 2 (full isolation). the reproductive isolation value for two populations is the sum of the proportion of successful matings of each type within populations (aa + bb) minus the sum of the proportion of successful matings of each type between populations (ab + ba). the table provides data for the geographic distances and reproductive isolation values for 27 pairs of dusky salamander populations.

In 2015, about ten percent of total u.s. energy consumption was from renewable energy sources. renewable energy plays an important role in reducing greenhouse gas emissions. when renewable energy sources are used, the demand for fossil fuels is reduced. sanjay and his family want to cut back on their use of non-renewable resources at home. they are thinking of an alternate way to heat their home without adding more greenhouse gases or pollutants to the environment. which renewable resource would not fit into their plan? a) solar power b) burning wood c) constructing a wind turbine eliminate d) generating hydroelectric power